[Oblarg]

This one requires a bit of context:

At the beginning of one of our meetings, we noticed that some of the shelves on the wall of our "programming cave" (they span the whole room and are directly above the computers) were in less-than-prime condition. In fact, they were pretty much collapsing, so we removed everything from them and put a large "OUT OF ORDER" sign up, which one would hope would discourage people from putting things on the shelf...

Fast-forward to the end of the meeting. We're cleaning up, and the programmers need to put away some of the large stools in the room, which usually go on the shelves. Of course, they completely ignore the sign, and a minute or two later we here a massive crash and run into the room to behold a scene of wanton destruction. Well, not really, but one computer was very nearly crushed by a falling stool and the whole shelf assembly had pretty much ripped itself out of its wall mounting.

At which point someone pipes up:

"It's okay, they're programmers; they're not good with hardware!"