The "Kick Me" prank is iconic; it's the go to prank for unoriginal bullies. It's utile enough that a bully can use it to show he's a bully; he wants a victim kicked. Everyone gets to be in on the joke and the poor victim can't figure out why everyone's being so mean to him. This usually also demonstrates the Butt Monkey status of the victim. It can also be used to show that the erstwhile victim is clever; he knows that the bully is a bully and thus pulls the paper off his back.