I used to think when you drank Pepsi in the winter it would make holes in your stomach. That's what my dad told me ages ago to discourage me from drinking so much of it, even though my mom drinks a lot of it. I can't even fully convince my 20-year-old self that this isn't so.
A childhood belief about drinks

others believed things like this
- We told our little sister that she had a long bushy tail and she fully believed us for ages!!Anon
- When I was little my dad told me that if you drank too much coffee it would make your skin turn black. Anon
- I believd that if you ate popping candy and drank softdrink just afterwards your stomach would explode— Kat
- My 3 year old little girl announced after spinning around for ages that she was 'feeing guilty' :-)— Adam
- I used to believe that when winter came and it snowed the grass just died or went away for the winter.— Chris
- I used to believe that if you point at somebody you make holes in the air and the fairys fall over— Bob #1