I can think of tons of crazy things that I have done in my life, but the craziest would have to be from when I was 17 and after three years, had finally grown my hair out long enough that I could put it up in an up-do for my grad. My school used to have Terry Fox Day and would, during the weeks prior,encourage the students to raise money for the cause. If you reached your goal, you had to shave your head during assembly on the day Terry Fox Day was held.
Needless to say, not only did my friends reach their goal, but so did I. So three weeks before my graduation, there I sat in a chair in the middle of my school's gymnasium with elementary, junior high and high school (including my boyfriend) kids in the bleachers. I not only cut all of my hair off, but I was now the proud owner of a buzz cut that showed only three centimeters of hair.
So yeah... shaving my head three weeks before HS grad was probably the craziest.