I've noticed the last few times I've been babysitting that my 12yr niece has taken to closing and locking all the screens and doors. It used to drive me nuts when they wouldn't close the screen doors and let all the mossis and flys in. So the change is quite noticable.
Apparently its because of zombies.
For me it was Werewolves after American Werewolf in London. My elder brother took us out of the theatre before the main character had even changed, cause I was huddling in the foetal position in the chair with my hands over my ears.