Okay I guess I'll throw mine in.

This was about 4 years back. I was living in my fraternity house and there was a party going on. Well my girl at the time and I decide to go fuck up in my room on the third floor. Party was mainly on the 1st flootr and some on the second. Well. We are about midway through fucking. She is on top and riding me hard. My door lock was the kind where all you need is a thumbnail to unlock it from the outside. Well. All of a sudden the door flys open and theres one of my Brothers Conrad with 6...all hot sorority girls. My girl at the time and I look over in disbelief as Conrad is trying to cover his eyes and find the door knob to close the door. Well as he is doing that, my girlfriend gets off of me and hides herself under the covers leaving me fully exposed, and I notice all 6 girls are all looking at me, but not making eye contact if you know what I mean. Conrad finally closes the door, and we bust out laughing. We couldnt finish which sucked but when we got dressed and went back downstairs, there was a much larger group right at the bottom of the stairs and everyone gave us a round of applause.

Embarrasing? Totally. I went and bought a deadbolt lock the next day.