Lots of similar stories in my time of course. One of my favourites is the time my wife and I were in France. We came out from a Church and as usual there were people around the car. But one couple from the far East asked if they could have a photo standing by the car. I said of course but there was alot of to ing and fro ing as I gradually realised they wanted a picture of me with my arm around the lady's waist looking as if we were about to get into the car. Weird. Luckily my wife thought it was amusing.
Imagine showing your friends a photo of your holiday which is basically a stranger with his arms round your wife......
Nick