well if all the guys are telling their slap stories..
hardest slap i took was at a dated party: my date beertapped me, so i pounded my bottle like a champ and then snuck in my retaliation shot on her full beer. the contents surged forth in a fountain that reached the heavens, completely soaking her and only her. all the dudes in the vicinity from all the other frats were cheering and high-fiving me. i saw her take a full wind up but i didn't even stop her because i felt bad.
most surprising slap was when a girl was telling me a story at a bar, and i just totally zoned out staring as the hottest girl at u of maryland walked by. that shit was totally uncalled for but you don't get mad because to be honest having a girl slap you is pretty exhilarating.