First off I have to get this out of my system. Maby it is just the voices in your head messing with you.
(I know bad J/K). Ok now that's out of my system. One other thought, I wounder if it is not the ignition chime. It might have a short or maby it is wore out to where it vibrates enough to where it sets the chime off. Just some random ideas. Hopefully they help.