Plastic wrap on the toilet, they got to pee and it makes a big mess, or hide and hit the other person with a bag off apples. put salt in the sugar container and sugar in the salt shaker. Crank call a pizza place or friend.
spray wood cleaner on the floor in front of a door. It makes the floor slippery and they cant walk. then set up a clear trip wire and have in front of them that they could fall into or that would get them dirty. and if you wanted to you could take a pic and use it as black mail>LOL