Not exactly, but, well...
Back in the day, Mrs Didge and I were at Bondi Beach when an enormous wave picked us up and slammed us into the sand. Not just us, though, it knocked everybody down.
I got back to my feet, patted her on the bottom, and thought, "Sheesh! She's lost here bikini bottoms." I looked down and, sure enough, I had my hand on a very bare backside.
I looked up and saw that it was somebody else.
Fortunately she was old enough to laugh about it. If it'd been a kid she'd have cried rape and I'd have been in all sorts of trouble.
And what was Mrs Didge doing while all this was happening? She was standing behind me laughing. >:-)