What would you do, if you're at a club or bar, and a woman came up to you and said "I'm engaged, change my mind."?

Honestly this happened to me a while back. I was at a bar with my wife, she was in the restroom, and a girl came up to me and said just that. I responded by saying "lady I'm married, and if I weren't you'd still not have a chance with me" and then my wife came back.
What would you do, if you're at a club or bar, and a woman came up to you and said "I'm engaged, change my mind."?
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