I can't decide what exactly is the relationship between the bum and the waitress. I think he's either her father or there's a relationship where she reminds him of his daughter and he reminds her of her father. Calling her "lady" makes me think that he isn't her father, but in the same line he says he's crazy, so who knows. But at the least, it's talking about the relationship between a father and a daughter. The waitress had a lousy Dad, the bum was a lousy father to his daughter. The waitress either is or reminds him of his daughter, and the waitress responds to the bum either because he is or he reminds her of her father.
I can't decide what exactly is the relationship between the bum and the waitress. I think he's either her father or there's a relationship where she reminds him of his daughter and he reminds her of her father. Calling her "lady" makes me think that he isn't her father, but in the same line he says he's crazy, so who knows. But at the least, it's talking about the relationship between a father and a daughter. The waitress had a lousy Dad, the bum was a lousy father to his daughter. The waitress either is or reminds him of his daughter, and the waitress responds to the bum either because he is or he reminds her of her father.