PLEASE HELP PRANKS TO PULL ON FRIEND!!!!?

So my friend is sleeping. I cant make her pee because i dont wanna wash my sheets haha or draw on her face cause she'll get really pissed. I wanna do something funny like putting a fake head by her so when she waskes up she flips! to bad id have one. Please help!!! im rlly bored!!! (: ps. were 14