Oh, god. So many...
Black-out drunk at a party. Fucked a girl I'd just met in my friend's spare bedroom. It was an open-plan loft, and, apparently, quite the show.
Vegas pool party. Drinking my own body-weight in strawberry daiquiris. Followed through with what I thought was going to be a sneaky fart. Ended up spending the next two hours running back and forth to the filthy bathroom to piss fluorescent pink diarrhoea out my arse. Didn't stop drinking.
Friend's wedding. Bailed on my prearranged cab home in favour of trying to fuck the groom's sister. Only discovered she had other plans -- to bait-and-switch set me up with her not-at-all-hot best friend -- when I got back to her room. She kicks us both out. I have no dough for a cab. Friends have all gone home. And the place I'm staying is a solid five hour walk in the cold. The not-hot girl offers to let me stay at hers. I reluctantly agree, then make excuses to go back inside the hotel, lock myself in a random bathroom (in the hopes of spending the night there), only to get thrown out by security (ten minutes later) just in time for the cab to arrive. End up at the not-hot girl's house. Wake up the next morning feeling rather ashamed of myself.
Work holiday party. Talk everyone in my immediate vicinity into rounds of shots. Hit it off with a co-worker who is a few years older, much more senior, and drop-dead gorgeous. Both end up extremely drunk - and all over each other right in the middle of the bar (in front of the heads of the company). Head back to her place, but in the middle of the cab ride back she takes a turn for the worse and throws up all over herself and me. I full-on carry her out of the cab, to her front door, only to discover that she's 1) lost her keys, and 2) has recently moved back in with her mother after a break-up. I'm forced to wake her mother up, explain what happened, carry my "date" upstairs and lift her (fully-clothed) into the shower to try and sober her up, then strip out of my own puked-on clothes for her mother to wash while I spend the night in the spare room. Next morning was a little awkward.