middle school boys and the bathroom

What is it with middle school boys and the bathroom?! What is wrong with them that they can't just go in there, pee and come out? But noOoOo! They feel the need to wad up wet paper towels and throw them up to get stuck on the ceiling when they are in there. Or have a mosh-pit/fight club. Or make strange noises. Or best yet- make "water balloons" in the sinks. And no, if you must know, they were not water balloons. UGH, BOYS!