Did you hear about the thief that preferred robbing criminals and babysitters?
Did you hear about the thief that preferred robbing criminals and babysitters? He cleaned out every crook and nanny. This is a spoonerism, and also a pun. Normally to "Clean out every nook and cranny" means to clean something entirely, or completely, however in this case "Crook" means a criminal, and "Nanny" means a person that takes care of children, and cleaning out in this instance it is being used to mean "stole everything from", so the second statement sounds like a common phrase with only two letters reversed, but it has a completely different meaning than the normal phrase.