I thought, "He's trying to pull a fast one".
or
A jump rope.
or
Fun-ny!
or
Three: One to screw it in, and the other two to help him down off the keg.
or
Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
or
The bartender offers him a warm smile and says, "For you, no charge".
or