OK, so I have a 2005 Chevy Classic (Malibu). It runs fine, but the last couple weeks, when I take my first right turn off of my street I hear a sound in my trunk like the gas jug is loose and tumbling around. I keep forgetting to just pop open my trunk and tether it. So today I turn on my car, and as soon as I turn it on...I hear that sound. I think 'that's odd'. So I turn the car off....and it makes that sound again. I turn the car back on, and it makes the sound a 3rd time. Then whenever I make a turn it makes the sound....except if I take a slow turn. Which again leads me to believe that there is something loose in the trunk...except there's not. I check under the car to see if anything's loose, and there's nothing I see. WTF is going on here? It's more annoying than anything, but I'd like to know if my gas tank is about to fall off or something.