Pranks dares and jokes!?

im having a sleepover with my freinds and the theme is jokes pranks and dares. any ideas of whjat i can do. nothing that will hurt or affect there appearence. but something funny. i already know like tickle there nose and put shaving cream on there hand and hand in warm water saran wrap on toilet. but any others kinda like that? please? ok were kinda young to. like 11 so ya. only answer if u hav a dare prank or joke plz.