To wish an actor prior to his going on stage to "break a leg" is a well-known practice.
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Related: break a leg
Prev: I hope you break a leg in your performance tonight!
Next: Well it's the four leafed clover. This is very rare, about 1 in 10000 and is also usually associated with Ireland. Break a leg. Fingers crossed. Good luck vibes. I hope you strike gold.
