I used to believe that if you drink one drink after another, you would get diarrhea.
Such as drinking juice and then soda.
A childhood belief about weeing and pooing

others believed things like this
- I thought that soda was also called "pop" because if you drink too much of it, you'd explodeAnon
- I used to think that apple juice was beer and I'd drink it all the time and pretend to be drunk.— Dee
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I thought there was a legal drinking age for soda (I had always been told that soda was not for children).— Dial Zero
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- once i was drinking aot of orange juice and my sister said i would get drunk if i had too much— deanna