During our visit to London, one day, in a hurry, I went to Royal Albert gallery to use the visitor's loo.

This was written on the wall probably by a Scottish patriot using red colour spray over the peeing area.

"You English never wash your hands after a pee, but we Scottish do"

and this was the reply written below in green colour, probably by a Pommy!

"We English never piss into our hands, but you Scottish do"