Shake, Rattle and Roll - Minus the Roll (2nd Gen iPod)

[Apotheos]

My 2nd Generation iPod has developed a distinct "rattle" sound during forward/backward motion. It's completely absent during lateral motion.

It's clearly coming from the upper part of the iPod. It's very distinct, almost to the point where I'm sure its something that I should be able to see moving.

Any thoughts on what this is, if it can be fixed, and if I should seek warranty repair on this?

[Impulse29]

I had the same thing with my old gen 1 iPod. I don't remember how it started, but it's like theres a loose screw in there. How did I fix it again? Oh yeah, i didn't... someone stole my iPod!...