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The line is in reference to the 1933 Mae West and Cary Grant movie I'm No Angel. West plays Tira, a dancer and lion tamer at a carnival. After running into trouble, Tira is in dire need of money. Tira asks Big Bill Barton, the owner of the carnival for a loan. Big Bill only will only agree to a loan if Tira puts her head into a lion's mouth in a stage act.
When one of Tira's admirers, Jack Clayton (Cary Grant) compliments Tira on one of her acts, she replies, "When I'm good, I'm very good, but when I'm bad, I'm better."