How do you sell a used, foreign-made car that's in really bad shape and has weeds growing through it?
Post an add saying you have a Buick for sale. When whoever stops by and asks where it is, show him the clunker and tell him it's the Buick - Beat Up Incomplete Car Kudzu.
Lighten up. They're jokes, I've heard much worse jokes being told about Jewish people, people that belong to any race other than white, and dead babies.