If you could become an expert at one completely random skill overnight, what would it be?

If I could wake up tomorrow with expert knowledge of any skill, I'd choose medicine. I'd love to be a doctor, not just for the title, but because being able to understand people's illnesses, treat them and possibly save lives is something I find very meaningful. There's something special about being able to help someone when they're at their most vulnerable.

If you could become an expert at any completely random skill overnight, what would you choose, and more importantly, why?
If you could become an expert at one completely random skill overnight, what would it be?
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