What are the funniest pranks you have seen Soldiers do to each other?

Against my better judgement I'm going to go ahead and ask the community this question. Are you, or were you, a prankster? Have you ever prank called the staff duty desk? Did you ever lovingly mess with your first line supervisor (or higher!)? Tell us your stories, and for those currently serving make sure you practice OPSEC in this thread! Wouldn't want anyone getting in trouble. Also, unless it's original try to exclude cherry pranks. Everyone knows the classics like getting a new private to go to supply for grid squares and chem light batteries. I'll start things off with one of my own pranks.

When I was in Afghanistan it was part of my job to help get the platoon sergeants vehicle ready for mission. Making sure the gunners ammo cans were secured, helping set up the blue force tracker, all that good stuff. As part of an escalating prank war with my platoon sergeant I started leaving an artistic present for him when he arrived at his TC seat. I would draw on the plastic dash right in front of his seat a big ol' wiener drawn in chalk. He had a choice, he could either have it staring at him the entire mission, or he could rub it off!