When I was about 4 years old I went through a glass door. I was playing that stupid childhood game tag, running around the outside of my friends house. I was about to catch him, when he made a dash for the front door, closing it behind him. I was too close to stop so I went through it, I managed to only cut my arm, albeit rather badly. The cut missed the main vain and exposed the bone, also took 88 stitches to patch and Lets just say a 4 year old seeing the entire inside of their arm, including the bone is not a good thing.