Every (former)child in my family has a copy of the record "The Muppets Christmas With John Denver". Just a few Christmases ago we were all sitting around talking about it, and my sister and cousins were saying something about how much fun it must have been to record it. I casually observed how funny it was that it was an album supposedly made by singing puppets, and they all looked at me like I had just shoved Santa off the roof. Even though they were in their late 20's/early 30's, they still believed that the album had been recorded in some giant studio, with John Denver really surrounded by all the Muppets, who were really all being worked by the puppeteers so they were "singing along".
A childhood belief about songs

others believed things like this
- I used to think a world record was a record of all the people in the world singing .— JACK REGAN . [SWEENEY . ]
- As a child, I thought that Olivia Newton-John was Elton John's wife and Juice Newton's sister.— Connie
- As a child I used to think that Olivia Newton-John and Elton John were married.
Boy, I was way off.— Lisa - The muppets were REALLY inside the T.V.!Anon
- I used to think that Olivia-Newton John was three people like Sharon, Lois and Bram....Olivia, Newt and John— J
- i used to think that when i went to sleep gonzo from the muppets would suck me up through his nose and eat meAnon