Urine, anyone?

My kidneys are remarkable organs. No matter what I drink, my piss is always yellow, and smells of piss. I drink water, my piss is yellow and smells of piss. I drink Coke, my piss is yellow and smells of piss. I drink lemonade, my piss is yellow and smells of piss. I drink Mountain Dew, my piss is yellow and smells of piss. I drink beer, my piss is yellow and smells of piss. I drink wine, my piss is yellow and smells of piss. However, when I eat asparagus, for some reason known only to my kidneys, my piss is yellow and smells of rotten eggs... I'm off to take a leak. Here's a recipe for Asparagus and Leek Soup.