My friend told me that for a long time she thought that the Rolling Stones song "I Can't Get No Satisfaction" was really "I Can't Get No Bitch in Action". Her version of it is actually better than the real one, it sounds more rock and roll.
A childhood belief about misheard lyrics

others believed things like this
- i used to believe the rolling stones wrote rolling stone magazine.Anon
- I thought that the song "Built this City" by starship went as follows. "Milk and Cereal, Rock and Roll"Anon
- I was sure that Led Zeppelin was the lead singer of the Rolling Stones.— dave
- I used to wonder why people didn't use his first name when they spoke of McJagger of the Rolling Stones.— silly me
- I thought Rock and Roll were 2 musicians, with one who rocked and one who rolled.Anon
- I used to believe the the Elton John song, "Crocodile Rock" was about a Crocodile, named Rock.Anon