1. paint everything in your sisters room black see what happens
2. get your sister or brother a drink put pepper in it....
3. play all your music really load
4. blackmail them O.o
5. act like a cow.
6. lick them O.o
7. give them a bread sandwich
8. set their alrm for two in the morning
9. bite them
10. flush the toilet when their in the shower
11. ding ding ditch their room
12. eat their food
13. be right in their face when they wake up
14 sit on them
15. put your cat or dog on their face see if the animal farts in their face XD