You're the eight

Joe was going to into his usual bar before lunch when he saw a poorly-dressed man fishing in a small pool of rain water about five cetimeters deep outside it.

Joe stopped and watched the man for a few minutes. He saw the most of the people who passed by him believed he must be rather mad. 

Joe pitied the man, so after a few minutes he went up to him and said quikly, "Hello, would you like to come into the bar and have drink with me?"

The fisherman was delighted to accept his offer, and the two went into the bar together. Joe bought the man a few drinks and finally said to him, "You've been fishing outside here, haven't you? How many did you manage to catch this morning. If I may ask?"

"You're the eight," the fisherman answered merrily