I had a 10th grade bio teacher who always gave 50 question multiple choice exams (i.e. 2 points per question).

She always offered a 'shoot the moon' option. If you could get every question wrong you would get 100 for the exam instead of 0. Of course if you got one question correct, you would end up with just a 2 for the exam.

As I recall there were several successful attempts during the year.