A fellow with a stutter goes into the pub and orders a pint of beer. The barman pours the beer and says,"Here you are Donkey." He goes and sits down in the corner.
After a time he goes to the bar and orders another pint and the barman says,"Here you are Donkey."
After a few trips to the bar and getting his beer , another customer says to the man, "You've been buying beer all evening and after each purchase, the barman has said,"Here you are Donkey. Why does he call you Donkey?"
The man with the stutter says, "I don't know, hehaw, hehaw, he always does."