Hey! This just came to me....
Maybe his lawn mower really isn't a lawn mower at all, but a Transformer!
The guy goes down to Junior Sample's Auto Sales and THINKS
he's buying a prime 1974 Chevy C10 pickup, equipped with racoon tail on the antenna, and a gun rack. He gets home, goes in and grabs himself a PBR from the frig, comes back outside and there's an MTD sitting in his driveway.
It could happen because I saw the movie.