What would you do if someone kissed you unexpectedly?

What would you do if someone kissed you unexpectedly?

Out of the blue.

To me it happened once. I was consoling this woman, she was going through a bad time and had drunk a couple of glasses. Out of the blue, she reached to me and kissed me on the lips. Was quite delicate about it, and not the typical drunken slobber.

I just pulled away and pretended nothing happened, she just mumbled she had drank too much. But she wasn't that drunk in my opinion, just used it as an excuse.

Updates
+1 y
I was already married at the time, so after some days I told my wife, for transparency.
She didn't care at all, she knew the woman, said that a kiss like that is nothing especially she was drunk and mourning a loss at the time.
What would you do if someone kissed you unexpectedly?
Post Opinion