A lemon, if you didn't know, is essentially just a bad car, cheap, damaged, whatever.
I learned of a special 24 hour endurance race called 24 hours of lemons, of course making fun of 24 hours of le mans. All cars must be worth $1000 or less, excluding safety stuff.

I made my own little lemon, tho I made a mistake giving it 600hp rather than 50. I kind of want to see some more lemons especially from great car makers :P

Shameless ad, I know, but here is my lemon