My cousin, Heather told me when I was about 5-7 that there was a boogie-man living in my grandmother's fernace. I asked her "I can't see it, is the boogie-man really in there?" and she'd say "He can see you, but you can't see him." I believed this since age 10.
A childhood belief about monsters

others believed things like this
- My grandma told me and my sisters that the boogie man lived in her basement and if we cried he would get us.— Paulette
- I used to think that my dog was the "BOOGIE MONSER" because he would always go and sleep under my bed!— ChristieGirl
- When i was about 3 or 4 i thought Gene Simmons was the Boogie Man.— miss13
- I used to believe that the boogie man would come and get me if I didn't listen to my parents.Anon
- i used to think that my dad turned into the boogie monster at night if i picked my nose before i went to bed— hollie
- I thought the Boogie Man was made of boogers-all green and slimy.— Boo