This is going to sound crazy, but it's very real. When I take a piss, it usually just smell like piss. But the fact is, I've been pissing for so long that I don't even notice. However, when I eat hamburger steak with gravy and onions, my piss smells like, guess what? . . . right . . . hamburger steak with gravy and onions. No other food does this. What's going on here?