The little burglar alarm lights in the corners of rooms used to terrify me when I was small. You know, the little motion detector things. We had one in our living room that would show a red dot if you moved in its line of sight, and when I was about four, I was really scared of it.
To try and calm me down, my dad said, "Oh, it's okay. If you see a red dot, it's fine. The time to really worry is when you see a blue dot." (There was no blue dot, it was meant to reassure me.)
For about a year, I then wouldn't even be in the same room as the damn thing, in case I saw the blue dot. Oops! Points for effort, though, Dad.