A man walked into a restaurant on a slow night...

...and sat down. He seemed unsure what to order.

The waiter asked him if he wanted a hamburger, and he said, "No thanks, I tried it once but I didn't like it."

So the waiter responded, "Well would you like a pizza?" but the man answered, "No, I tried it once but I didn't like it"

The waiter wanted to know if he'd like to eat a steak, and again the man replied, "No, I tried it once but I didn't like it. As a matter of fact I wouldn't be here at all, but I'm waiting on my son."

The waiter said, "Your only child, I assume?"