Why Does Stale Pee Smell So Bad

I remember when I was a kid, there was this guy who made the round on talk shows. He would pee and then drink it on national T.V. Do you remember ever seeing this guy? In any case, he would make the claim that urine is actually very clean and a great source of excess nutrients that your body has expelled. I am not so sure. To me, one of the worst smells in the world is stale pee. The building we meet in on Monday mornings has this problem, the school we meet in for church has this problem, my daughter's morning diaper has this problem. I don't know if its the same in the girls bathroom, but in the men's...when someone doesn't flush the urinal it just wreaks. Its a repugnant smell that is a little sweet, a little sour, and wholly disturbing. Every time I smell it, it sticks in my nose for days. I don't know why it stinks so bad if the stuff is so clean. I'm not a biologist, so I won't venture a guess; but for my money there will be no drinking of pee.

P.S. Lest you think I am consumed by smelling pee, I thought about this only because I set here with the smell in my nose after changing my daughters morning diaper. Smell they say invokes the strongest memories.