I used to believe, until I was 5, (I'm 12 now) that the little design in the bottom of paper shopping bags was a monster, and when I got too close to the bottom, I would get attacked.(Well, anyway, it looked like a design when I held it to a light, and saw the overlapping paper, but I also thought that that was the only way you could see the "monster".)
A childhood belief about going shopping

others believed things like this
- I thought brown paper grocery bags would fit more than plastic grocery bags.Anon
- i believe in the tooth fairy so much that i make paper bags for her!— Monster High girl
- I thought the boogey monster was a monster that ate boogers at night in front of youAnon
- I used to believe that your belly button was what held your top half to your bottom half...— Debelouwho
- I Used To Believe The Monster Beverage/Energy Drink Was Monster Milk!— KellGirl
- I used to believe that your bottom teeth were actually in your bottom— jez