What would you do if you got a $200 tip on $20 bill?

I have a birthday coming up and I will be spending it alone. So I was thinking about doing this; so at least someone is happy on my birthday.
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Okay so she was on the verge of crying. Apparently they need to have you confirm anything over $100 with the manager. Oops. Guess I should have brought cash instead.
What would you do if you got a $200 tip on $20 bill?
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