Too bad I forgot how to ride a bike. I tore around the neighborhood on my bike (no training wheels) from ages 8-10, didn't ride for a few months after I turned 11, and got back on to discover that I couldn't do it any more. Kept falling, over and over. When I was 15 I tried again, with a friend coaching me, for several hours-- no dice. Someday I might manage to learn again, although adult bikes intimidate me (all those gears, it's like a stick shift). I also forgot how to swim between the summer I was 7 and the summer I was 8, but I managed to re-learn that one.