This is a true story--
My significant other, a man I adored at the time and although we didn't live together, we spent a great deal of time together, was walking through my bedroom. I was about ten feet away occupied with something. He bent over, saying "What is this?". I said "I don't know, what is it?" "A condom." "A what?" "A condom. Why is there a condom on your bedroom floor?" (Note: We didn't use condoms--it was a long term monogamous relationship.) "That's weird, why would there be a condom on my floor?" We peered at the offending object together. It was a condom.
I was a Neilson television rating "family" at the time, and the Neilson guy had been there that day, in my bedroom, rehooking up my bedroom television. I watched him most of the time, and he spent a lot of time squatting on the floor.
I know the condom wasn't my condom. I really don't think it was my SO's condom. Seems as though he would have just picked it up off the floor and not said anything instead of asking me what it was. I wouldn't have noticed because I was doing something. I had no other inkling that he was unfaithful.
We decided the Neilson guy must have left it, either accidentally or just to be a troublemaker. Years later, we still talked about finding a condom on my bedroom floor.
It's not quite as colorful a story as the condom flying in through the window while the wife was at the toll booth, but it seems almost equally implausable.