Somebody at work likes to leave their sponge in the kitchen sink, and it truly disgusts me.  Maybe it's because a sink typically isn't a very clean place to begin with.  Plus, the sponge keeps getting wet when people use the faucet, so it's a breeding ground for mold.  And then there's the fact that the sink is used for washing dirty things, which spreads the dirt throughout the sink.  It kind of defeats the purpose of washing dishes if you're using a dirty, moldy sponge. #health