Sustained at the Australian Open this year when I fell down 3 steps of Court 3 during the Sjeng Schalken vs Jurgen Melzer match. Bjorkman Girl insists it was because Melzer was in the middle of a shirt change when I walked in, but I honestly didn't see the players until after I fell!
I twisted both my ankles and whacked the bone behind my right ear on a chair in front. My left ankle was particularly bad and I couldn't walk for about 3 days... it actually flared up again yesterday because of the cold weather. This apparantly means I'll probably get arthritis in it later on
My other worst injury was in 1994 when I got a badly ingrown toenail and went in for surgery to get the whole big toenail removed. The stupid surgeon only removed a portion of the nail instead and dressed it badly so the bandage all stuck to the nail. I couldn't get out of bed for a week because any slight movement of the foot put my whole body in agony and when the nail did grow back I had a massive growth underneath it which has only gone away in the last couple of years with the help of a podiatrist.