take a mayonnaise jar and clean it out. Put vanilla pudding in it and take it to school and eat the vanilla pudding in front of everybody. You will see what I mean everyone will think it is mayonaise but really it is just vanilla pudding.
As your boy is hooking up with a completely gross girl
::taps him on shoulder::
"Yo bro, lets hit up the deli, I'm getting a sandwich with extra mayonaise"
"Dude you put way too much mayo on that sandwich you ate for lunch