John and Ed walked into a bar. Ed: "What do you want to drink, Jackass?

"John: "A..A...A pa...pa..pi..pint o..of gi...gi..gi Guinness A..a pint of Guinness, please."

Ed goes up to the bar. "Two pints of Guinness for me and my mate Jackass."

Ed takes the drinks back. "Here you go, Jackass."

Later when they had finished their drinks, Ed says to John, "It's your round, Jackass. Go get us a pint o' Guinness."

John goes to the bar. "T..T...T..two pa..pa...pa..pi..pints o..o..of gi.. gin..gi..Guinness. Two pints of Guinness, please."

When the barman was sure Ed wasn't listening he said, "I think it's awful him calling you Jackass all the time." John says, "Oh, he..aw, he..aw, he..aw, he..awlways calls me that."