The Math pretest

One day in math class when i was a freshman in highschool, my math teacher was sick and wasnt there so we had to go to another teacher's room down the hall. My math teacher had left us a multiple choice 70 question packet that was in the format of a math pretest as work to keep us busy for the class period, and we'll go over it near the end of the period. Everyone is fooling around, and not really caring about the math work. I figure all i need to do is write down answers, seeing as how this wasnt being taken for a grade. So i take out a piece of paper and number it 1-70, and put the packet in my bookbag. I then begin to write down answers on my paper, and i'm done within 2 minutes. Me and my friend joke that there's no way i'll get any of this right. About 3/4 of the way through the class, the teacher begins to go over the packet. I take mine out of my bag, and check the answers. By the time class ended, we had only gone through 40 questions, but i got all of them correct. Craziest, most lucky thing ever to happen to me school-wise. TL;DR: guessed every answer on a pretest, got every question right

Whats the craziest thing thats ever happened to you?