When I was 4...My sister and I were playing airplane (you know the game where you get up on you tummy on the other persons feet and they hold you up?) Well we had perfected it to where she would toss me off and i would flip and land on my feet.. Well apparently she flipped me off the wrong way and i went head first into the wall.. A concusion and a broken arm later.. I realized I wasnt playing that game anymore..