If I kneel on my left knee, I get a horrible "hot poker" stabbing pain on the outside of my knee. The first time it happened, I had knelt -- on my left knee -- on my bed, felt something poking me, and tore apart the (already messy) bed to try to find whatever had poked me. It felt like a hot, pointed rock, or something similar that isn't quite sharp enough to easily pierce the skin (but would with enough pressure).

There was nothing there; whatever is wrong is internal. This is reproducible, as I have to my dismay discovered. Obviously, I need to get this checked out and will make an appointment with my doctor, but until then, what is this?!?! Anyone have any ideas?