Sneak into someone's room while they are sleeping. Make sure they are really sleeping, like in a deep sleep. While they sleep pour honey all over them, put mustard on there face, molasses in their hair, etc. Just get them completely dirty and nasty. Just remember DON'T WAKE THEM YET! Take all their clothes and hide them and replace them with embarrassing clothing; like a costume or something. After you do that to wake him/her up have a bucket of ice (flavored optional) and poor it on them.