Worst burn I ever got: we were bending glass with a Bunsen burner in science class. Our glass snapped, and idiot that I was, I instinctively reached to pick it up and grabbed the wrong end. 2nd-degree burns at the tips of my index finger and thumb--MAJOR ouchie. Almost passed out from the pain. I was also quite embarrassed, considering we'd been warned before even starting the experiment NOT to touch the hot glass.
My other worst injury--sprained my ankle, by stepping in a pothole the wrong way. I was wearing a 30-lb backpack at the time, too, so I went down HARD. Thought I'd walk the rest of the way to the car, but lost my balance and went down again. THAT one made it so bad I couldn't walk on it for a couple days.