30 year old woman. Brunette. Quite fit but also "buxom." IOW, abs and tits. I was 16 at the time. Did I accidentally see all? Yes. Was she accidentally showing off all? I doubt it. She was nekkid on a lawn chair in her back garden.
Granted, there was a fence between our houses.
A chain link fence.
I reacted like any 16 year old boy probably would have. I stood there for a second making sure I was seeing what I thought I was seeing. Then I stood there a few minutes longer enjoying what I was seeing, until she looked over, smiled at me, and I ran the hell back in the house. I suppose it could have gone in a Penthouse Letters direction, but I was a teenage boy and freaked out at "getting caught looking."
Needless to say, however, the view was fap fuel for years. Awkwardness was minimal because contact was minimal. I didn't want to have to explain to my parents why I was suddenly hanging out in our garden all the time. Plus, I reckoned that if I'd seen all, one of my parents would do as well at some point.
New question: Ever reverse shoplift? As in, sneak into a shop and put something on a shelf that didn't belong there and which you had brought in with you?