1. paint everything in your sisters room black see what happens

2. get your sister или brother a drink put pepper in it....

3. play all your Музыка really load

4. blackmail them O.o

5. act like a cow.

6. lick them O.o

7. give them a хлеб сэндвич, бутерброд

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 или dog on their face see if the animal farts in their face XD