Nope, a disco club. I can also recall one similar situation to the one on the pic, in which i was in... slapping the door, cheering .. and then running away.
If you ever find your self in the situation where you know the guy in the cubicle next to you is holding on until you leave, then make exaggerated 'leaving noises' (clumping your feet, running the water fast etc) then just wait silently.
As soon as you hear the first splash give them a rousing cheer.
I don't see in a taking a shit funny, it's just as natural as eating, drinking and breathing. If someone finds that funny i think they are mentally challenged (unless it comes with unusual sounds, then permission to laugh is granteed) or a 10 year olds. Clould be just me though.... Nor i don't usually hold, i can't see a point of that honestly...everyone does it, who cares...