A fellow walked into an ice cream parlor with his dog under his arm.  “No dogs allowed,” said the owner. 

“But this dog can talk,” said the man.  “Listen, I’ll ask him three questions and if he answers, I eat free here tonight.”

The owner agreed.

“Spot,” called the man, “what’s the opposite of smooth?”

“R-r-ruff,” barked the dog.

“What’s on top of a house?”

“R-r-ruff,” the dog responded.

“Right again!” cried the fellow.  “Now, who’s the best baseball player?”

“R-r-ruth,” said the dog.

The owner picked up the fellow and the dog by the scruff of their necks and threw them both out in to the ally. 

As they lay there, the dog looked quizzically at the fellow and said, “Aaron?”