YEOW! Man, it took me a week to accidentally find it, but there's at least one place on my left knee that causes quite the jolt of pain when anything more than miniscule pressure is applied. I located the sensitive area when I went to scratch an itch. DANG. Well, now I'm wide awake for sure. :P After that unexpected dose of pain, FURNITURE would be wide awake.
And the freaking spot that was itching, which caused this episode in the first place, STILL itches. Phooey.