I used to think that if someone gave you acid, you could completely counter the effects by taking an antacid.
A childhood belief about drugs

others believed things like this
- When I was a kid I heard that the Beatles did acid and I wondered if they melted from it.Anon
- i used to think tha if you went outside when it was acid raining the rain would burn holes in your skin— fear of rain
- I used to think that when people were taking their contacts out that they were taking their eyeball out :) — Jen
- I used to believe that if you broke your arm (or whatever) it came completely off.— Jill
- I used to believe nun's shaved their heads and were completely bald.— Mark
- I used to believe that our insides were made completely out of tuna— molly n