u turn, n.All

Why did the policeman give the sheep a ticketIt made an illegal ewe turn

A U-turn is really an n-turn if you think about it.

Why did the ram run over the cliff edge?Because he didn’t see the ewe turn

A U-turn is a maneuver that there's no shame or awkwardness in taking on the road but on the sidewalk, it’s impossible to change direction in a socially comfortable manner