Though it was only counted as a 0% in the gradebook, I literally got a -20% before on a quiz in 7th grade geography class.  I got every question wrong, and the teacher offered a "bonus" in which if you tried to answer it and got it right, it was an entire 20 points, but if you got it wrong, it was 20 more off.  So not really much of a bonus...considering I got it wrong.