I thought that Neil Young's song "Let's Impeach the President" said the words "Let's impeach the president for smiling" instead of "Let's impeach the president for spying".
A childhood belief about misheard lyrics

others believed things like this
- I thought Santa was the President of the North Pole. It was stupid I know
lol— Lynn Wright - I thought that FDR was an government organization during the Great Depression, not a president.Anon
- My 18 year old brother thought the former vice president was named Al Gorbachov.— Jeff
- I was pretty small when Nixon was President. I thought "Watergate" was a type of alligator.— Ginger
- I used to believe that President Ford invented the automobile.Anon
- i used to believe that everytime we elected a president was because the old one died!!:)— angel