Feeding sharks

I was listening to a band called "Sleeping at last" (if you haven't heard of them, I highly recommend looking them up) and a lyric stuck out to me especially. The lyric was, "walking on the ocean floor, feeding sharks out of our hands" and it got me thinking about the possible metaphor behind that line. Feeding sharks out of your hand is a dangerous activity that encourages familiarity with an animal that has a reputation for being destructive, dangerous, and unpredictable. It reminds me of some instances in my own life where I feed my sharks, or destructive life patterns. I have weaknesses, like anyone, that more often than not I embrace rather than attempt to conquer. I adopt these flaws as a part of me, encouraging them and feeding them. There are "sharks" everywhere in the form of alcohol/drug abuse, anger, pornography, and self-deprecation, among many more. Why do we feed them? They are dangerous and will try to kill us given the chance...and they are always hungry. What are your thoughts? What are some of your "sharks"?