My worry, especially the possibilities that arise, is what mostly shapes my experience of paranoia. Some, like ensuring that all of my home's doors are closed to deter burglaries, are inevitable. Others are more subtle, and I think my more invasive thoughts are what set them off. For example: I shouldn't hold the fork in a particular position or for an extended period of time, lest I be overcome by the urge to take my eye out.
Most of them may be categorized as "normal" worries.