A snail goes into a pub, comes up to the bar and orders a beer.

Bartender says “You taking the piss mate? We don’t serve molluscs here.”

Snail, outraged, asks why not.

The bartender refuses to elaborate, and just tells the snail to piss off.

“Listen,” says the snail, “I’m not leaving until I get my beer.”

At this point the bartender has had enough of this. He picks up the snail in one hand and hurls him out the door.

Two years later, the bartender is there, getting ready for the evening rush, when the same snail appears in the doorway.

Bartender looks at him and says “You again?”

Snail looks back and says “Hey man, what the hell?”