Absolute true story here,
I was 19, and was 69ing with my girlfriend in her parent's house while they were there. They had this connecting bathrooms thing, so while we went into seperate bathrooms, we would open the doors to the common shower area and throw down, but as you might expect had to be very quiet.
Well we are 69ing, and when I came, I let out a big old protein fart at the same time. We were both laughing our asses off, but we could not laugh out loud for obvious reasons, and that just made it that much funnier. I was mortified briefly, but thankfully she started laughing, which eased the mortification slightly, but still a bad situation.
Never were caught, though, that would have been a really bad situation.
B.