I am sure our own Raggytash may confirm or deny this one. On the wall of the gents in the Duke of York, Eccles -

"Nick fucks sheep"

"Yea, well, I'm Nick and I only fuck nice looking sheep."

"Well, I'm a sheep and I only fuck good looking Nicks!"

"Well, I'm a Shepherd and while I have been reading this, some bastard has Nicked all my fucking sheep!"

:D