Sure sign you are at a good party.

Out cold at 4am.

We tried lifting this guy to get him to his buddy's car, but our technique wasn't quite right. Four of us grabbed him - one to each limb - and lifted. But instead of holding his ankles and wrists, we held his pants and shirt, by mistake (well, we were also a little gone by then, and we were laughing so hard we didn't concentrate on the task at hand). And we lifted. He stayed down, and we had his clothing in our hands. So instead of having one passed out dude on my friends basement floor, we now had one passed out naked dude on my friends basement floor...

Update: Apparently there was some Indian dude who passed out in the dog bed too... (h/t JC. Go read his blog!)