My grandma told me that smelling people's farts would help us grow taller. I'm pretty sure she did it for her own amusement.
A childhood belief about farting

others believed things like this
- i used to believe that if i walked in the rain i would grow taller.Anon
- i used to believe that you were suppossed to grow taller than your parents, and then when i didnt i was sad.— crysb83
- when I was younger , I used to soup made you grow taller — dark-titouan-du-55
- I used to believe that my grandma's chandelier would grow wings and chase me and kill me.— Katrien
- my mom told me that if i held in too many farts, i would explode. i took it seriously.— ginger
- Maryland was actually a huge amusement park, i.e. Merry-Land, like Disneyland. — Julianne