Girls, how would you react if a guy mistakenly grabbed your butt?

Anonymous
The other night I was at a bar and saw who I thought was my good friend from behind. My friend and I always give eachother a playful pat on the butt, so as I walked to the bar I gave her a pat and said, "what's up, Kim?" To my horror it wasn't her! I apologized and explained how I thought she was my friend and that I'm not a perv. She was so cool about it and even laughed. I just wonder how most women would react.
Girls, how would you react if a guy mistakenly grabbed your butt?
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