Prank Wars in the Work Place

Do you ever think about playing a prank on someone at work? 

Well here at Townsquare Media we have a "no food on the 4th floor" rule. So, yesterday Marianne started up a little prank war with a fake melted Ben & Jerry's Ice Cream cup. Placed it in a few places and made people turn heads left and right. Do you have any classic prank wars that have happened in your work place?  Feel free to share with your prank war stories us!