Let's see... I don't drink so I'm certain I'm sober by that time. So if it's a stranger, I wouldn't even go near him or her.
If its only in the cheek:
Girl - I guess its okay. I mean she's drunk and I'll be somewhat thankful because at least its me and I
won't think of anything about her if that happens.
Guy - I'll be obviously confused and flattered. But then again, he's drunk so he won't even remembered he
did that, and I won't even go near a drunk guy unless I'm really close to him.
If it's a kiss in a lips, I'll be shocked and push away the girl, or hit the guy hard with my fist on his face.