As the man is leaving, he's approached by the barman who says, "Hey, you're not gonna leave that lyin' here, are ya?"
"Hmph," says the man, "that's not a lion, it's a giraffe."
I searched for "a man walks into a bar who are you" on google. This was the first joke I read...
I have spent too much time reading philosophy to give you a better self-summary. I don't know how to be a self and interact at the same time. It's a paradox really. Jokes are better than selves anyway.