Environmental Enlightenment #18 (If It's Yellow Let It Mellow)

Yep, you read the title correctly and I'm sure that most of us have heard the phrase, "If it's yellow let it mellow, if it's brown flush it down." For those who haven't heard the phrase before, the first part means that while using the restroom one wouldn't flush the toilet after urinating and instead "let it mellow." The second part of the phrase refers to always flushing after solid waste. Some people get really grossed out by this concept and honestly I don't see any rational reason for it. Also, I don't know why I didn't start doing this sooner!