I believed that my slow-witted best friend had made up the song "Here comes Santa Claus, Here comes Santa Claus, right down Santa Claus Lane!" because ... well, it was so stupid! She told me it was a real song, but I just didn't believe her.
A childhood belief about songs

others believed things like this
- I used to believe that the "real" Santa Claus was at Macy's in New York City. All the rest were fakes. — Marcia
- I used to believe that, if God would die, Santa Claus would be boss.— Judith
- My parents told me that Jesus visited Santa Claus when he was dead for three days. — Rick Hamell
- I used to believe that the Holy Trinity was Dad, God and Santa Claus!— Cathy P.
- When i was little, i thought Santa Claus was my grandfather— Junie
- Wehan I was little I used to confuse Jesus with God with Santa Claus.— Gui