"Alcoholic Courage" joke

A young man entered a bar, walked to the counter and told the barman,
"May I have a question, sir? I heard that a drink of beer will bring you the courage to do something terrible that you hate to do? Is that right, sir?"
"Yes, I guess so," the barman answered with a smile.
"How much beer then?"
"It depends. Why don't you try and find out?"
"OK, then give me a glass of beer please."
Sitting in the corner, the young man kept asking for more beer. After the fifth glass, the barman looked at the man with a wink, "Well, how do you feel? Am I right?"
"Uh yes, I feel the courage growing in me, but not enough," and then he ordered another drink.
Three more glasses and then the man stood up, saying to the barman with a very strong voice, "All right, thank you for the beer, sir. I'll stop here. I think I'll make it now!"
This time the barman could not overcome his curiosity. "Yes, I can tell that from your face," he said, "but may I ask what is that thing that you hate to do so much, man?"
The young man said, "Just telling somebody that I have no money in my pocket, sir" he answered wryly.