The Teacher introduces three English idioms connected with head.
banging one`s head against the wall:hitting one`s head against the wall; repeatedly doing something that is frustrating and has no positive result
Head in the clouds:elated, euphoric, joyful, preoccupied
An old head on young shoulders alsoa wise head on young shoulders: a child or young person who thinks and talks like an older person who has more experience of life My little nephew said people who dislike other people don’t like themselves very much. That’s an old head on young shoulders.