Not the drunkest/highest I've been, but the only thing that resulted in something odd for me...
I was at a friend's house a bit before Thanksgiving last year, just hanging out and drinking. He had, which was unusual for him, a bottle of vodka that he offered to me, for a nominal fee. I started off with a few vodka's and some kind of soda, and then played 7 games of vodka pong... I guess we must have kept winning, but I don't remember much after the 4th (I'm a lightweight, I admit it). Someone apparently passed me a bowl some where along the line and I smoked a bit too, but I was gone by then, I heard about it the next day.
To get to the point, I snapped out of my lovely little blackout giving head to a guy I don't particularily like in his dorm room. I almost bit him, it freaked me out so much. I went along with it though, and to this day I don't think he knows that I remember at least part of it. Thank god I didn't fuck him, that would have been awful.
We don't get along much now. I know how I am when I'm drunk, and it was probably my suggestion, but still, he should have known better.