A guy walks into an upscale bar wearing a shirt open at the collar. He is met by the bouncer who tells him that, according to their dress code, he must wear a tie.

So the guy goes out to his car and he looks around for a necktie but discovers that he just doesn’t have one. He spots a set of jumper cables in his trunk. In desperation he ties these around his neck, and actually manages to fashion a fairly acceptable-looking knot and lets the ends dangle free.

He heads back to the bar and the bouncer carefully looks him over for a few minutes and then says, “Well, okay, I guess you can come in - just don’t start anything.”