A childhood belief about special powers

My parents always told me that anything was possible if i tried hard enough. Combining that thought with my new knowledge about evolution and how species ajust themselves to the surroundings, i figured that if i walked backwards to school every day, eyes would grow out of my neck. I did that for weeks, but i didn't tell anyone because i wanted it to be a surprise. To my disappointment i couldn't feel anything grow in my neck, so i finally asked my dad how long evolution normally takes. 1000 years sounded a bit too much for me, so i gave it up and went back to my life planting candy in the garden "because how do you know it won't grow if no one has ever tried it before".