I've a couple of funny ones;
I was injured by a small plastic bottle of orange juice once and still have a scar running from a corner of my mouth; we'd all gone to do a demo at this coastal town, all was hooked up for us including hotels. Great night of free drinks, but of course the hotel fell through. The driver had pulled a girl so there were about 6 of us having to find places to sleep. I have a sleeping bag, so I find these bushes and sleep inside them (oh, and when I woke saw graffiti everywhere basically saying it was a gay rapists alley "anyone coming here will be buggered" etc was daubed all over the place- so it could have been much much worse).
At about 4 am I get woken in the dawn by a fierce rainstorm, so stagger off to find shelter. I had no money, no food, but fortunately a small plastic bottle of orange juice which I'd tucked away in the sleeping bag with me, so I go to open that. Now it seems orange juice ferments when in a hot sleeping bag, and as soon as I open the bottle the cap shoots into my face at 100 mph, leaving the aforementioned permanent scar. Loved that morning, loved it!
I've got a pretty nasty curved scar above my right eye too. I was living near Marseilles at the time, and went to a party where I got absolutely steamed. At about 4am (again) I set off for home, down all these flights of stairs which went on forever besides these tall buildings. I had my board with me, so after a while decide to go down the wheelchair ramps. These led on to a narrow downhill path which was in absolute pitch darkness, and I remember distinctly standing on my board completely shitfaced thinking "I'm getting pretty bad speed wobbles and can't see anyhting, I should put a foot down or something sometime soon" when I hit the chain which had been put across the path at the end at mid-shin height. Of course I pitched miles onto my head and knocked myself out. Came to in a pool of blood; I wore glasses at the time, and had basically dirven one of the lenses into my skull; I remember just looking dumbly at the blood jsut pouring out of my face. Had to walk a couple of miles to mine with a sacrificed t-shirt round my head and my face a mask of blood, when I looked in the mirror I could properly see my skull. The hospital was another 5 miles away and I had no money, so would have had to walk it and was in no state to, so I slept in my tourniquet and went in the morning...
As for skate injuries when actually skating, well I've had quite a few as well but the stories aren't as funny!