Was there something you were afraid of as a child that just seems silly to you now?
When I was a kid, I had the idea that Bigfoots (Bigfeet?) lived out in the woods around the house and would come out at night; and while they weren't necessarily hostile, they were dangerously unpredictable -- so if they saw you in the house they might attack for inexplicable reasons. (This, I believe, was inspired by an episode of In Search Of... in which random and mysterious Bigfoot attacks happened in wooded areas.) Thus, I was afraid to go anywhere near the giant plate glass windows in the kitchen or back room, because they might see me and attack.
Knowing now as an adult just how built up the area around our house actually was, the idea of Bigfoot living in our tiny little two acres of wood seems pretty darn ridiculous -- whatever your stance on the existence of Bigfoot might be.