Would they steal an old blanket or something?
Yup, someone took a striped sheet off our car - it was held in by the doors, too, so they must have made some effort to get it off. I drove round the corner to find my sheet covering someone else's car.
I noticed they didn't offer to scrape the ice off my car though! I don't like using the de-icer spray on the windscreen so usually try to get OH to do any scraping needed.
If I'm taking the newer car I just put the heater on and wait about 1 minute
But if I'm taking the other, older car I think I'll have to start it an hour before I want to drive it so it thaws out. Must remember to cover them both over this week - I'll have to see if I can find something even more tasteless than a stripey sheet to put over them.