A bum, who obviously has seen more than his share of hard times, approaches a well-dressed gentleman on the street.

“Hey, buddy, can you spare two dollars?” The well-dressed gentleman responds: “You are not going to spend it on liquor are you?”

“No, sir, I don't drink,” retorts the bum.

“You are not going to throw it away in some card game, are you?” asks the gentleman. “No way, I don't gamble," answers the bum.

“You wouldn't waste the money for fishing gear, flies, boots or rods, would you?” asks the man. “Never,” says the bum, “I don't fish.” 

The man asks the bum if he would like to come home with him for a home cooked meal. The bum accepts eagerly.
While they are heading for the man's house, the bum's curiosity gets the better of him. “Isn't your wife going to be angry when she sees a guy like me at your table?”

“Probably,” says the man, “but it will be worth it. I want her to see what happens to a guy who doesn't drink, fish or gamble.”