What pranks can you pull on an 8 year old at a sleepover?

Ok this really Is not a sleepover prank but they

do have to be asleep.1st you take a sleeping victim and tie (him or her

perferable him) to a desk. Pour pudding down the back of pants.Then pour ice

in croch area.and pour water on them( ice water ) till they say they will be your

slave or tell there deepest secret.