What is the most embarassing thing you've done around the opposite sex?

Mmmm. Recently.

I was out drinking with a few friends (2 other guys and 3 girls) and well into the morning we went back to one of their houses and proceed to hit the pipe some. I had just started drinking again and I finally was able to handle myself well drunk but had never really mixed the two before and once the high kicked in I had to sit down. A girl came over and sat next to me on the couch blathering about some shit I was trying to pay attention to but had absolutly no chance at.
Then it just hit me, I felt myself get sick, think for a moment "I wouldn't even get close to the bathroom anyways" and just start puking in my lap. In my drunken haze I thought I could just politely put my hand up and cover my mouth as if burping.