Okay, someone on the forums asked "Worst place to have sex ?" and while some of the answers were interesting, very few were "honest". So, let's have your personal honest moments, that still stick out in your mind after all these years.
Like I answered in the forum, in the front seat of a 1990 Toyota Tercel Hatchback.

Yep, a car like that one. Only mine was white. We had been driving around town after a movie looking for a 'spot' to enjoy some time together. Couldn't go to my house because Dad would kill me, and couldn't go to her place because her parents would kill me too.
So, after awhile of talking about "things", we finally pulled into a parking deck, top-floor, and things got hot and heavy. Needless to say that after a 'satisfying' evening all around, I found out the next day that my passenger seat was making a strange noise. Since the car was under warrenty, I went to the dealership after about 5 days of this noise, and found out that the seat was cracked underneath and the seat had to be replaced because of bent frame. The noise was the seat vibrating. The bent frame was from .... use your own imagination.