I didn't have any beer but didn't want to feel left out, so I brought a 750mL bottle of Jagermeister. Every time they took a sip, so did I. Trying to keep pace with people drinking beer using hard liquor proved to be a mistake, and I drank about 2/3 of the bottle in ~20 minutes. Now, when I drink, I get vertigo, and in this case it was bad enough to make me sick.
I go to the shared bathroom to empty my stomach into the toilet stall, only to find it in use. Unable to wait,
I vomit in the sink. The girl using the toilet chose that exact moment to emerge, and when she saw what I was doing she told the hosts of the party. [She admitted she was the reason I couldn't use the toilet, but I was still too embarrassed to stay. I went back to my room and passed out for a couple hours.
So, what's your most embarrassing story?