Dave took a break from tending bar and was hanging out on one of the benches for a few minutes with his wife. 

Joe was working the door and came over to ask Dave a very important question.

Joe:  Hey Dave there’s a girl at the door who can’t find her ID.

Dave: Well if they don’t have an ID, they can’t come in. 

Rule #1 of the door, typically learned on the first day of the job.