Well I'm sitting at work bored out of my mind, so its time for a new thread. This is open to all types of embarassing moments, so maybe some 8thers can get a few chuckles. I'll go first.
Ok so I was 16 and I had been dating this girl for about a month. She was also 16 (quite pretty I might add), and we were both virgins at the time and we both decided we wanted to be each other's first. Since we both had very strict parents, this was easier said than done. To make matters worse, her father was a weight lifter and quite big (about 6'3, 250 lbs) and thought all teenage boys were nothing but trouble. Go figure.
Anyways, we devise a plan to sneak me over her house on a Friday night and go for it. Her house had motion-sensor lights on the outside and a burglar alarm that her parents set every night at 10pm, so it was going to be difficult. In order for me to sneak in, she had to leave the basement door slightly ajar so that when the alarm was set, the door would still be open.
I arrived at her house about midnight, and got in with no trouble. So we are on the couch, we turn on a movie for some background noise, and then start kissing and yadda yadda yadda. Eventually we are both unclothed, and right as I'm about to finally do it, we hear someone coming down the steps to the basement. She tells me to hop behind the couch and throws all of our clothes (hers and mine both) on top me. She pulls a blanket over her and lays on the couch like she's watching the movie.
At this point I'm absolutely terrified. Her dad appears in the room and this is the conversation that ensued:
Dad - "What are you doing in the basement at this time of night?"
Ex - "Oh just watching a movie, what are you doing up at this time of night?"
Dad - "Well I actually just wanted to check the basement fridge and make sure I moved the turkey from the freezer to the fridge"
At this point I'm thinking "WHAT THE HELL?!?!?!" Are you kidding me?!? Who the hell checks to see if they put the turkey in the fridge at 1 in the morning?!?!?
Luckily, he walks off, checks the fridge and goes back to sleep. We both got such an adrenalin rush from this close call and we both just get dressed and agree to do it another time.
Close call but I still never got caught

I just had to wait till the next weekend :)