Out of the mouths of babes

Neither of my children understands what a joke is.  They mangle them, they make up decidedly unfunny stories, and they yell a lot about the failure of the other child's joke.  Out of all this, though, my son inadvertently came up with something funny  That is, after I thought about it quite a while, I realized he did a good job of standing a genre on its head.  Here it is:  "A man walked into a bar and said . . . ouch!"