One of the most bizarre pranks I've ever witnessed occurred in a building where the flooring consisted of wooden bricks installed over a concrete surface. The building's workers all had roll around tool carts that they stored there. One of the workers went to get his cart one morning only to discover that overnight someone had removed the four wooden bricks on which the four wheels of his cart rested and filled the holes with fresh concrete, thus cementing his cart to the floor.
Not that I'm trying to re
cycle old ideas, mind you.