List them down here!
I'll start the ball rolling....
1)Smokers who leave their cigaratte butts on the sink or in the
urinal!
eeeeeeeew!
2)Kids who purposely throw wet toilet paper on the ceiling and
walls.
3)People who wash hand so vigourously that u will get soaked
standing near them
4)The same people who shake their hands dry, causing water to fly
everywhere.
5)People who stand right in front of the sink and instead of using
it, begin to slowly style their hair in front of the mirror, thus
depriving others who really want to wash their hands
6)People who cut queue at the cubicle "queues"
7)PEople who pee and spit on the floor of cubicles
8 ) people who's pee stains the top of urinals (must be a really
TALL guy )
9)People who slam the cubicle door very loudly (might shock some
Shi.tters and cause the shi.t to get stuck halway...)
Add on to the list! 
