At Sun we have lots of whiteboard walls where people can (well, could, theoretically) scribble down brilliant ideas while they’re discussing deep technological issues over coffee. What they mostly get used for is trenchant corporate humor, as above (note that the “Clothing Optional Teaming Area” has been so named for a very long time).
Some responses were philosophical:
Some inscrutable (to me, anyway):
(I would have used a loaf of bread, a jug of wine, and thou.)
And my personal favorite:
^ the intersect of “times of true bliss” and “times with pants on”.