Also when somebody is always looking around them to make sure no bugs or small critters are in the area.
Person 2: What are you doing?
Person 1: Oh, it's my critter paranoia, I really hate bugs.
Person 1: *jumps up off the couch*
Person 2: What's wrong?!
Person 1: I thought I saw a spider crawling on my leg.
Person 2: Man, you got critter paranoia, bad.