Puns are little "plays on words" that a certain breed of person loves to spring on you and then look at you in a certain self-satisfied way to indicate that he thinks that you must think that he is by far the cleverest person on Earth now that Benjamin Franklin is dead, when in fact what you are thinking is that if this person ever ends up in a lifeboat, the other passengers will hurl him overboard by the end of the first day even if they have plenty of food and water.