Why do we tell actors to break a leg? Because every play has a cast!
Break a Leg
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Explain Bear
Alright, listen up, nimrod. This is a pun. When someone says "break a leg" to an actor, it means "good luck". But a "cast" can mean the actors IN a play, or a plaster cast that you put on a broken leg. The joke is that they sound the same, but have different meanings. You probably think mayonnaise is spicy.