I consider myself a part of the 1/2 mile high club. The story goes as such. I was on a 4 hour red eye from Toronto - Vancouver. I was seated between a very nice elderly couple and there were about twenty empty rows in the back. After ascent the stewardess (a very attractive young woman who at my time was close to my age) could tell that I wasn't traveling with the couple and asked if I'd like to take an empty row in the back. I thanked her, nodded goodbye to my elderly take-off companions stood up and asked the stewardess if she cared where I sat. She gestured vaguely and said, any empty row. So I walked back a few rows and found an empty row... what I thought was an empty row... at this point remember it was a night flight. And so I plopped my ass down on the aisle seat. At this point I'm gonna mention this was at an awkward period in my college years where I was a little heavy from keg parties. I was 6'1 and probably around 200lbs. Anyway...
The seat wasn't empty.
Unless you've ever teabagged someone (and I haven't) the sensation of a face being squashed under your ass is an unusual one. It was foreign to me but I immediately realized from both the sensation and high pitched squeak that something was amiss. I had sat on a tiny Asian woman's face. She had jet black hair and was wearing black denim jeans and jacket.
So I stood up and apologized profusely (more than the average Canadian). Sorry. The flight attendant however dropped any pretense of professionalism and nearly hit the floor laughing. I slunk away to the back and took a (this time definitely) empty row. The next 4 hours were brutally awkward. The stewardess laughed everytime she looked at me. It was the second most shameful thing I've ever done on a plane.
I've always wondered if that stewardess and Asian woman are telling this story now and how it sounds. Still I'm gonna count it as a mile high thing as had it been intentional it would probably constitute some sort of sexual misdemeanor.
TL;DR: A stewardess watched me accidentally teabag an Asian woman on a plane.