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There are many options for pranks and a lot of them involve physical humor. Come up with an idea that is funny and will keep your friends laughing for days. For example, you could try one of these pranks:  Put toothpaste on your friend’s fingers, then tickle their face. You could also use peanut butter or whipped cream. Put shaving cream into his/her shoes. If someone opens their mouth to snore, squirt sour spray! Draw on them with a black (not permanent) marker. Make a silly design on their face or arms. Anything you can access without waking them up. Draw a mustache and a beard. Just make sure it is the kind of marker that will rub off easily. Prank calls are a great way to create hilarious memories with your friends. Just make sure you don’t call anyone that will be offended by your prank call. You should only call people who will appreciate the humor since it’s all in good fun.  Try calling someone and asking someone if their refrigerator is running. When they say yes, tell them that they better go catch it! You could also make prank calls using the cell phone of a person who already fell asleep at your sleepover. Just make sure you don’t do anything that could get them in trouble. Pranks that scare someone for a moment can be hilarious. But be careful to keep the joke lighthearted. You want the people that you prank to be able to realize it is a joke right away, rather than being legitimately scared. For example, you could try one of these pranks:  Put makeup on your face to make yourself look like an insane clown. Then wake up your friends! Hide in the shower behind the shower curtain and pop out when someone comes in to use the bathroom. Just make sure to do it before they start using the bathroom to avoid any awkwardness. Sometimes people do funny things in their sleep and it can be really funny to record it or to talk about it the next morning. But, even if no one does anything funny in their sleep, you can always pretend they did as another prank!  Tell someone they said funny stuff in their sleep. For example, you could tell your friend that while he was sleeping he said, "I love the lunch-lady". If someone is a terrible sleep talker, record the funny things they say.
Try a funny prank. Make prank phone calls. Try a scary prank. Try sleep-related pranks.