You know that metally/glass vibrating sound when someone with a killer stereo pulls up next to you with the tunes blaring? Well I was getting than tinny sound when I hit bumps. It was as if the rear deck were loose. I thought for sure a Bose (POS) speaker was loose or something. Couldn't find anything in the trunk.

I was going to live with it since the Maxima has other rattles too, but this one was driving me crazy. It turned out to be the scissors jack--it was ever so slightly loose in the rear-right. When I tightened it up, the rattling went away. Thank goodness because it was truly annoying!