A blind man walks into a bar...
A blind man walks into a bar, grabs his dog by its hind legs, and swung him around in a circle. The bartender says, "Hey buddy, what are you doing?" And the blind man says, "Don't mind me, I'm just looking around."
Here is the second "walks into a bar" joke that I have written up. This joke relies on the listener understanding what a seeing eye dog is, and also understanding how they work.
The critical element in this joke is the fact that the blind man is apparently able to see through the eyes of the dog that he is swinging around (which is funny because that is not how seeing eye dogs work in reality.)