I hurt the knee playing softball back in late November or early December. Trying to change direction after aggressively rounding first base, i jammed my knee (my leg locked straight upon planting). It's been bothering me off and on ever since. If i keep it static for an extended period of time, either sitting or sleeping on my back, it loses much its flexibility and hurts when i try to use it. This is obnoxious since i'd normally sleep on my back 80% of the time.
Occasionally, i'd a small torquing force in my knee would cause it to twinge. During this twinge, it felt like a ligament or tendon would catch on something (possibly loose cartilage) and, rather than flex in a continuous, smooth motion, it'd violently snap into place like one of Kirk Hammett's guitar strings (or whatever simile you'd prefer). My knee didn't care for this, and it'd swell up a little while later in protest.
Anyway, i wanted to make sure i got this out before i left. This way, my fans would know to start baking my Get Well cupcakes and/or cranberry-orange breads.