Q: Why do we tell actors to “break a leg?”
A: Because every play has a cast.
Break a Leg
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is a play on words. When you tell an actor to "break a leg," it sounds like you're wishing them harm. But "cast" has two meanings: it can refer to the actors in a play, or a plaster cast used to fix a broken bone. The joke is funny because the answer takes the phrase "break a leg" literally, implying that the play needs a cast (medical) because someone broke a leg. I bet you need an explanation for this explanation, don't you?