Some other examples of the concept, perhaps, would be:

• A woman leaps out of her rocking chair in a rage and her husband says, “You’re off your rocker!”
• A soldier gets his nose shot off. When the nurse looks at him sympathetically, he shrugs, “No skin off my nose.”
• An impotent man who uses marijuana to arouse himself, explains to his partner, “Where there’s smoke, there’s fire.”