One Christmas Eve, a barman looks down and sees a snail on the bar.

"A pint
of bitter, please," says the snail.

"I'm sorry," the barman says, "we don't serve molluscs."

"Why not?" asks the snail.
"We just don't. Piss off."

And with that the barman flicks the snail off the
bar.

The next Christmas Eve the barman looks down and sees the same snail on the
bar.

"What did you do that for?" asks the snail.