Lampshades are usually attached to lamps with a small piece on the top that screws on. These can occasionally loosen by themselves over time, and quite often on second floors of old buildings when the floor regularly shakes (lightly) as people walk by.
When this happens --in a matter of just weeks after tightening the lampshade-- it will begin to rattle. I'll sometimes walk through a room without any carpet and two or three lampshades will rattle as I pass. Is there any way to prevent this slightly annoying noise in an otherwise quiet room, and keep these lampshades tightened? I know, it's a funny question.
LOL, it's currently happening every few minutes on my sewing table that keeps shaking from the sewing machine.