(Probably apocryphal) tale of a pair of Blue Suits and a pair of Green Suits in the gents...
Blue Suits zip up and head out of the door, chatting to each other.
One of the Green Suits says pointedly:-
"In Sandhurst they teach you to wash your hands afterwards."
Blue Suit replies:-
"At Cranwell they teach you not to p1$$ on your hand."