I also heard the rumor about pop rocks and drinking pepsi. I tried it once, and I ended up having really bad gas, but at the time I thought I was dying. I also was told that if you drink orange juice after you drink the milk off of your cereal, you'll throw up. This doesn't happen either.
A childhood belief about dangerous food

others believed things like this
- I used to think that apple juice was beer and I'd drink it all the time and pretend to be drunk.— Dee
- once i was drinking aot of orange juice and my sister said i would get drunk if i had too much— deanna
- My friend told me you have to drink milk to get boobs LOOL— Roxanne
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- when I was little, I called coke and pepsi "Black Juice"— can I have a refil on the black juice?