I have a few, but a fond one is when calling on a secluded home in the Countryside, I could see through the Hallway and through the rear door to the garden, a couple were evidently sunbathing out there, after I rang the bell, the lady stood up, completely and gloriously nude, and persuaded her husband/partner to slip on a pair of shorts and answer the door.
I had quite a chat with the guy, a likeable guy, and a thinker, but I did not catch one more glimpse of the lady.
If I had been the sort of JW who actually did "Return Visits" I might have been tempted to try to repeat the experience on another Sunny day.