you get out of bed and your bones go snap crackle pop like a bowl of rice krispies..lol..
My jaw did that at dinner. No idea why it did it, it didn't really hurt but I'd have thought I chipped a tooth if I was biting something (I was actually opening my mouth at the time).
Story of my life - I'm doing something and I wonder "did I just get injured, I don't know - am I injured?" Of course I keep going until it's certain that I am in fact injured, or until the blood loss makes me pass out, whichever comes first.
You know you're getting old when you actually stop because you're injured. Back in the day, that never warranted an excuse to interrupt whatever you were doing.