I'd do a double take if I saw that on the highway.
I was just thinking about a movie preview that I saw awhile back - probably the same idea! Can't remember what movie it was but the guy drove up behind and very close to a car that was being towed backwards. He woke up the girl sleeping next to him by screaming and honking the horn. She woke up and nearly had a heart attack because it looked like the car was just about to run into them. Not funny - well, maybe a little...