While doing some extra foam rolling around my knee, to "scrub" the tissues there and work out any stiffness that might be contributing to the runner's knee, I managed to find the mother of all knots on my lower right quadriceps. Yowch! Definitely one of those "yikes! found it!" moments when I settled on it and started the contract/relax process to try and de-knot it. Didn't get it all, even after working on it for several minutes, but I didn't want it to be too sore before bed. Definitely will be something I'll have to work on for a bit yet. Glad I found it, though, even if it's a mess to work through.