i used to think that 1980s Pepsi commercial said: "Catch that Pepsi spirit, to get in, to get in, to get in" when they were really saying: "Catch that Pepsi spirit, drink it in, drink it in, drink it in..."
A childhood belief about adverts

others believed things like this
- when I was little, I called coke and pepsi "Black Juice"— can I have a refil on the black juice?
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- That you had to be a male to drink beer.— andrei gaspar
- I used to believe that you needed a prescription to drink Dr. Pepper.Anon
- I used to think it was illegal to drink hot chocolate in the summer. — Samantha
- I used to think it was illegal for children to drink coffee— C.W.