Jackass in the bar

A guy goes into a pub, sits down and orders a drink. The bartender passes the drink to him and says “Here you go, Jackass”. The guy drinks up and ask’s, How about another? The second drink comes and again, the bartender says, “Here you go, Jackass”. Another man at the bar turns and says to the first man, “Why do you let this bartender call you Jackass?” The man replies, “Heeaww, Heeaww He always calls me that!”