I used to believe that "Judy in disguise" was Judy in the skys :)
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that vanilla flavoring would taste as great as it smelled!!
Judy— judy - i used to believe that a volcano was an upside-down UFO in disguise— Sally
- i used to believe that my dog was really a cat in disguise trying to get information on the dog empire!— strange and used to be stupid
- I used to believe that eye-lash curlers were eye-ball eating aliens in disguise— Eliza