A blind man walks into a bar with his seeing-eye dog. He stands in the center of the bar, takes the dog by the chain, and starts swinging him above his head.
Everyone stops and stares. Upset about the way the animal is being treated, a patron runs up to the blind man and demands, "What the hell are you doing?"
The blind man turns toward the patron and says, "taking my dog by the chain and swinging him around above my head?"
"That's fine then," says everyone, who were initially expecting a different punchline to this joke.