My cousin's mom told my cousin that pop makes you short. He probably believed it.
A childhood belief about drinks

others believed things like this
- My cousin once told me that glass was made from ground up beetles, and I believed her! — benjymous
- I used to think a second cousin meant a cousin’s cousin.— Carlos Almonacid
- When I was younger, my cousin used to try to convince me that I was adopted and I sometimes believed it."Anon
- Someone told me that they cousin who used to think rain was God peeing.Anon
- When I was six, my cousin told me that if I stuffed my bra the cops would come get me and take me to jail.— Juliea
- When i was 7 my cousin told me that thelma from Scooby Doo was a mad serial killer.— Rachel