Here's the thing about bars—given the right mix of circumstances, they are some of the best places to witness pure, unadulterated foolishness. That is to say, they are the best places to get free entertainment and at least one good story for the next day. It's hard to pinpoint what exactly the right circumstances are. I know that they include alcohol, and people who are ready to come out of their box a little bit (a dark, quiet bar where everyone is looking to mind their own business is fine and necessary, too, but it won't work for these purposes). Someone playing 'It Wasn't Me' helps, something about the call-and-response nature of the chorus.