Prank to pull at Sister's Sleepover by prank master?

Question

K. My sis is having a sleep over. If you have a prank that i could do, please tell me. please make it be diff instead of the hand in warm water thing. Also, i'm not gonna cut their hair. Oh, and it can't make a huge mess or be harmful. Thanks

Prank Master

Answer 1

now this may seem a bit horrid but owell now dont u hate it when your sister drinks ur drink so it pay  back time now get aney dri8ng like cola now put sailt in it ti make it work plz right back and tell me if it worked

plz read
i have tried it befor so it does woek

Answer 2

pretend u broke your thumb and you can get a squirting gun and soke her to death