A couple of weeks ago, I was helping my brother-in-law install a set of lowering springs on his shiny new Subaru Impreza 2.5RS, and after doing a bit of work on the ground, I got up and discovered that I couldn't put any weight on my left knee. Now, as a kid, I'd damaged that knee pretty well when I helped a neighbor push her car out of the ditch; I put a bit too much weight over that knee, lifted on the car, and "POP", down I went. Nothing much was done at the time; my bones were still growing, and it eventually healed, although it was never completely right. I can tell you exactly when the weather is going to change, just by the feeling in my knee. ;-)
So, after two weeks of limping around, I finally went to the doctor today; I was immediately referred to an orthopaedic doctor, who I'll be seeing later this week. The expected outcome is that I'll get a few x-rays, an MRI, and arthroscopic surgery for a torn meniscus. Yay.