A man is having a few drinks at a bar when he looks over and notices a drunk guy passed out at a table nearby. The bartender tells him the drunk is Mr. Murphy and asks the man if he could drive Mr. Murphy home.
A man walks into a pub and sits down next to a man with a dog at his feet.
This concerns a question in a physics degree exam at the University of Copenhagen: "Describe how to determine the height of a skyscraper with a barometer."
Joe was moderately successful in his career, but as he got older he was increasingly hampered by terrible headaches.