"Please call Mike"

Got a really wierd note on my windshield this morning, before I left for work: it was something like "If you decide to sell your car, please call Mike [phone number]" It looked like a photocopy of a handwritten note. WTF? Is this guy wandering around the neighborhood, looking for cars he likes and leaving little notes on their windshields, in the faint hope that maybe one of them is looking to sell? Does this even make sense? Dunno why he'd want my car, anyway; it's over 10 years old, has bubbly tinting on the windows, and a rust-eaten tailpipe. It's also a Honda Civic - not exactly a high-end car. I dunno, maybe he's some poor college student who's looking for a cheap car. It still doesn't make sense.