Yeah...I had a kidney stone...maybe 15 years ago. It **HURT**...I went to the emergency room in the middle of the night, they did some 'tests', and I lay in this curtained booth, groaning, while they made sure it wasn't my appendix or something.
   As I lay in my misery, I heard rapid footsteps on the tile floor outside...then they stopped, and a guy in a while coat poked his head inside. He looked at me and asked "Kidney stone?"...."Uh...yessss", I panted, "That's...that's what they think...".....
"Um, hmmm" he said, "that's what it sounded like." sheesh! They can tell by the type of moaning!

(so then they decided it was, and put an IV in my arm as I groaned, and the nurse turned the little valve....and whishhhh...I was floating...no pain as a healthy dose of Dilaudid hit me...I lay there and counted ceiling tiles for a couple of hours till they did more tests....one of which drove the stone 'thru' and into lower areas, where it passed a couple days later)