A guy walks into a bar with a dog and tells the bartender “This is smartest dog in the world, he knows everything there is about sports. Give us a free drink and you can ask him any sports question you like”
The bar tender gives them a free drink and asks the dog “Who was the greatest ball player of all time?”
The dog goes “Ruff ruff ruff”
The bartender throws them both into the ally. The guys looks at the dog and shrugs.
The dog shrugs back and goes “Who? DiMaggio?”