Heh... if y'all are interested in really blowing your mind and returning yourself to your infantile, uncoordinated days, try brushing your teeth with your other hand tomorrow morning. Try to do it as quickly as you do normally.
Keep a towel on hand to wipe up the blood from jabbing your gums and cheeks and maybe take a lozenge to work to soothe your throat after almost swallowing the head of the toothbrush.
It's a good exercise to keep one's ego in check and remind yourself that you're not the greatest thing since sliced bread.