I don't often like sharing my worst drunk stories because they make me sound like a lush. I'm usually on the opposite end of the spectrum. I'm a heavier guy with a well-exercised liver. It's only once every so often I (let myself) go past the limit.
But I will say, on my 21st birthday, my friends did everything to get me as drunk as possible. It was college, so what else are you gonna do? I had reached a limit where I said, "One more shot, and I'm gonna barf". Unfortunately, one was forced up me; and, while I hate being right, I was right. I went and got some McDonald's then proceeded to keep drinking. We went to a few bars, I almost didn't get let in a few spots. Woke up with the worst hangover I've ever had (to this day). My head felt like complete static the whole day. I was blowing chunks, dehydrated, and overly photosensitive for a full day. I was at my girlfriend's dorm the entire time. I went back to mine the next day, and was still pretty immobile.
Still, a fun time all around.