When I was 7, I read this little story from some book of scary stories. In the story, a cat goes under a kids bed and unlocks a portal to the underground monster world and the monsters could grab the kid. When my dog went under my bed, I always thought that she unlocked the portal and the monsters were going to get me.
A childhood belief about under my bed

others believed things like this
- i thought that we were just a big story book that ended when we died— samantha
- I used to believe that a morman was a scary person who lived underground(actually called a moleman).— Mike
- i used to believe if i went to sleep monsters would get my family, so i thought i stayed up all the time— Luc Lemmel
- I thought tornados were monsters,and that they called out the national guard to destroy it.— Ben J.Grimm
- I use to cover my head at night because I thought monsters would give me a bad hair cut while I was sleeping!— Amy
- There ARE monsters under the bed but they won't eat you so long as you don"t get out of bed before 7am.— Sarah