Sometimes, there's nothing quite as satisfying as watching your sister jump in fright after you successfully pull off a scare. As long as you know her limits and don't push them too far, you can enjoy giving her a fright while getting a good laugh in the process.
Instructions
Pull off a stealthy surprise attack.

Wait for a time when your sister is fully engrossed in something, whether she's gaming, drawing, chatting on the phone, or buried in homework. Then, quietly approach her from behind. Once you're close enough that she won't notice your presence, shout "Boo!" and enjoy her startled reaction. If done right, this could be the easiest yet most rewarding prank of all. Bonus points if she doesn't even realize you're home when you do it.
Turn off the lights.

This prank is most effective if your sister believes you're either asleep or hanging out at a friend's place. Wait for the moment when she thinks she's alone, either in the house or just in her room, then sneak into her space and turn off all the lights. If you time it right, she'll panic, not knowing what just happened. If she knows you're home, you can grab a book and pretend to be lost in it in another room if she bursts in, screaming.
- Alternatively, put on a creepy costume and shine a flashlight at your face from across a darkened room to truly spook her!
Surprise her when she thinks you're sound asleep.

If you're on a long car ride or simply chilling in front of the TV, pretend to drift off for a while. Wait until you sense your sister getting close or moving toward your face. Once she's convinced you're completely asleep, spring into action—open your eyes wide and scream at the top of your lungs. If you do it right, you'll give her a genuinely terrifying shock in the most unexpected way.
Share a spine-chilling tale.

Invite a friend over to share some ghost stories. When your sister expresses interest in joining, tell her she really shouldn't because the tales are far too frightening for her. She'll beg and plead, and eventually, you'll pretend to give in. Before diving into your story, express hesitation, claiming that it's too real and you're worried it might freak her out even more. Finally, "reluctantly" tell a spooky tale involving something familiar, like a menacing teddy bear or an eerie old photograph. Once the story ends, you and your friend should pretend to go to bed; later, sneak something from the story—like the teddy bear—into her room and wait for her to scream in horror.
Wear a creepy clown mask.

This works best if your sister has a genuine fear of clowns. Believe it or not, this is more common than you'd think! If your sister is afraid of clowns, grab a clown mask and plan a scare. Wait for the perfect moment when she has no clue what’s coming, like when she returns home from school and knows you're lounging in a chair with your back to her. As she walks closer, turn around suddenly with the mask on, and watch her jump in fright!
Frighten her with fake bugs.

Head to a novelty shop and pick up some realistic-looking fake bugs to use for pranking your sister. Almost every kid has a fear of bugs at some point, and leaving one in a surprising spot will definitely get a reaction. You could place one in her backpack—though you might not get to hear her scream—or surprise her by setting fake bugs on her pillow, in the sink, on her dinner plate, or anywhere else you know she'll least expect to find them.
Tap on her window.

If you're looking for an epic scare, try tapping on your sister's window in the dead of night. Although climbing onto your roof isn't typically the safest idea, if you can pull it off securely, tapping on her window while she's in bed will definitely send a chill down her spine. You can throw pebbles at the glass or use a stick to gently knock on it. Afterward, quickly retreat to your room, pretending you're either asleep or studying so she doesn’t figure out it was you behind the spooky sound.
Hide in a box outside the front door.

This terrifying prank is absolutely worth the effort. First, find a box big enough for you to crawl into comfortably. Then, wait until your sister is home alone, and place the box right outside the front door. Ring the doorbell, and as soon as she approaches the door, jump into the box and lie still. When she opens the door and stands there puzzled, pop out suddenly and scream! The look of terror on her face will be priceless.
Plan a surprise attack from the closet.

This one is a bit tricky, but totally worth the effort if you can pull it off. Start by hiding in your closet. Then, call your sister, pretending you're not at home. Ask her for help and tell her you need her to go into the closet to grab something for you. As soon as she opens the door, jump out at her! She’ll be both terrified and confused at the same time. Of course, this will only work if your sister is the type to help you out with favors.
Change her desktop background to something terrifying.

If your sister has a computer, wait until she’s away or in the bathroom. Then, sneak in and change her desktop wallpaper to something spooky, giving her an eerie surprise when she returns. If you’re feeling extra devious, you could do the same with her phone background—just make sure to sneakily grab it first.
Use a fake spider to scare her.

A fake spider on a long, clear string or fishing line is a prankster’s dream. Find a sturdy tree branch and use the string to hoist the fake spider up. When your sister walks nearby, lower the string to make the spider drop down right next to her—or even land on her. She won’t be expecting it, and you’ll get a scream that’s music to your ears!
Leap out of the bushes.

Who says all pranks need to be complicated? Sometimes, the simplest pranks are the best. Just hide behind a bush when you know your sister will be walking by, then jump out and yell at her. The surprise will have her screaming, since she won’t expect anything like this during her walk. You can even snap a quick photo as you jump out to catch her reaction. For an added touch, consider wearing a scary mask or costume to really make her jump.
Tickle the back of her neck with a feather.

This prank is straightforward, yet it works wonders. Get a light feather and quietly sneak up behind your sister while she's absorbed in something. Gently brush the feather against the back of her neck. Be subtle enough so she feels the sensation but doesn’t immediately suspect it’s you. She’ll turn around, startled and confused, and might even shriek. If you can manage it, hide quickly after she spins around so she can’t figure out where the feeling came from.
Place a fake snake in her bed.

Fake snakes are a great way to frighten sisters of nearly any age. Begin by ensuring her bed is properly made or at least that the covers are pulled up. Next, place a large fake snake either on her pillow or tucked under the covers, making sure it's not visible at first glance. When she prepares to sleep and pulls back the covers, the sight of the snake will certainly make her scream loudly enough for everyone in the house to hear.
Surprise her from behind while she's focused on the mirror.

If your sister spends a lot of time grooming herself in front of the mirror, you’ve found the perfect moment for a scare. Just wear a creepy mask, smear some fake blood on your face, or create another unsettling look, then sneak up behind her so she doesn’t see you. Before long, she’ll spot your frightening reflection and let out a scream!
Give her a scare while she's asleep.

After your sister has drifted off to sleep, find something truly terrifying to place in her bed. It could be a fake bloody head, a massive snake, a creepy lizard, or a huge spider—anything you know will completely freak her out. Position it so it’s the first thing she sees when she wakes up, guaranteeing a shocking start to her day!
-
If you have several siblings, it’s even more effective to scare your little sister, since she’ll have more people to suspect.
-
Make sure you're not easily frightened.
-
A simple trick is to follow her around, staring and humming a creepy tune. It’s surprisingly effective.
The suggestions in this section come from the personal experiences of Mytour readers like you. If you have a valuable tip to share, feel free to submit it in the box below.
- Once the pranks are over, make sure your sister knows you still care for her and that it was all in good fun. Just be aware—she might retaliate with the same tricks later, so always be on guard!
- If your sister is a light sleeper, wait for her to be in a deep sleep before placing a fake bug or reptile on her bed. If she wakes up too soon, it’ll spoil the surprise!
- Make sure your prank is a complete surprise. For example, avoid doing it on April Fools’ Day, as she might be expecting something by then.
- Ensure your prank is scary enough to get a scream but not so terrifying that it leaves you spooked or causes her distress.
Warnings
- Your little sister will probably tell on you, as they tend to do.
- There’s a fine line between funny and frightening. Don’t go for dangerous or overly scary pranks. For instance, if you’re hiding under her bed in a clown costume, remember that she’s still young and might be terrified of a strange figure beneath her bed. Pretending to be a scary person planning harm could cause more psychological damage than you realize.
- Don’t scar her for life and make her afraid to date when she grows up just because you were the creepy person under her bed when she was little.
- Don’t go over the top with your pranks.
- Only carry out pranks that you would be okay with if the roles were reversed.
