I heard this story years ago. An advertising writer lived at the Edgewater Beach Apartments. One day after a grueling day trying to come up with a new slogan for his client at the office he decided to stop in at the bar of the hotel before going home. While he was sucking down his scotch on the rocks a guest of the hotel walked in and ordered a Budweiser. The bartender told him "Sorry, the truck's late. We're out of Bud right now". The guest replied "Well, if you're out of Bud, you're out of beer", and ordered a mixed drink instead.
The ad copywriter went to work the next day and presented the client with their new tag line.
And who says that no good comes from sitting in bars?