When I was little my sister told me that if you drank milk and soda together you'd explode. I never drank both on the same day.
A childhood belief about drinks

others believed things like this
- I used to belive that if you drank soda pop and ate pop rocks at the same time, your head would blow up. — erin
- I used to believe that you would explode if you drank cola and ate pop rocks at the same time.Anon
- I believd that if you ate popping candy and drank softdrink just afterwards your stomach would explode— Kat
- I used to believe the milk would get sad if all I ever drank was koolaid.— al
- I used to believe that men drank beer and women drank wine. Anon
- My Granny said if I drank milk and ate fish at the same time, I would die.Anon