Unconscious humor.

A sense of humor keen enough to show a man his own absurdities will keep him from the commission of all sins, or nearly all, save those worth committing.

Quoth Hudibras, I smell a rat; Ralpho, thou dost prevaricate.

For now the field is not far off Where we must give the world a proof Of deeds, not words.

He was in Logic, a great critic, Profoundly skill'd in Analytic; He could distinguish, and divide A hair 'twixt south and south-west side.

The worst of rebels never arm To do their king or country harm, But draw their swords to do them good, As doctors cure by letting blood.