Bad knee day

[unixronin]

I'm not aware of having done anything to it during the night, but when I went to bed last night, my right knee was fine.  (Well, "fine" is relative here.  Let's say "no worse than typical for lately" instead.)  This morning, I cannot bend my right knee without pain, and cannot put weight on it bent at all.

I guess my right knee's going to need surgery sooner rather than later.