"Excuse me, do you mind if I ask what you're up to?"
"Oh, er, yes, er, I'm just, er, filming leaves."
"Yes. I was waiting for my wife who's in visiting her father and I was sitting in the car just watching the leaves blowing on the trees and about the car park and was thinking about how hypnotic it all looked and perhaps it would make a nice wee film and... why, does it look a bit odd?"
The manager of the nursing home and her assistant laughed in a tension releasing sort of way.
"That's OK - we just saw you with a camera and wondered what you were up to."
They left me to get on with it, clearly relieved they didn't have to call the police to remove some nutter with a camera, or their lawyers in case I was a journalist trying to do some kind of exposée on their establishment.
Back home I remembered a piece of music I did with a friend back when I was in my early 20s, which I thought might go quite well with the images and would mean I wouldn't have to worry about copyright using someone elses soundtrack.