A man was walking down the street when he was accosted by a particularly dirty and shabby-looking homeless man, who asked him for a couple of quid for dinner.
The man took out his wallet, extracted a tenner and asked,
"If I give you this money, will you buy some beer with it instead of dinner?"
"No, I had to stop drinking years ago."
"Will you spend this on bike parts instead of food?"
"Are you NUTS! I haven't had a bike in 20 years!"
"Well, I'm not going to give you money. Instead, I'm going to take you home for a shower and a terrific dinner cooked by my wife."
The homeless man was astounded.
"Won't your wife be furious with you for doing that?"
"That's okay. It's important for her to see what a man looks like after he has given up drinking and bikes."