I read a scary book to my son the other night, and he couldn't sleep until midnight... and woke up at 3 am too! What a mess. My daughter loves scary stories so we picked it but then for various reasons, she didn't want to listen to this one so I read it to my son instead. Lesson learned!!
In related news, my son saw the scene in Harry Potter 2 where they find the opening of the Chamber of Secrets in Moaning Myrtle's bathroom... and now he worries that we have basilisks in our bathroom.
Have you ever had a scary story backfire?