A friend of mine used to think that "Lucy in the Sky with Diamonds" was "Snoopy is quite a guy!" Apparently I'm not the only one at the time that thought the Lucy he was referring to was from Charlie Brown
A childhood belief about misheard lyrics

others believed things like this
- I thought that the line was "Lucy in the Sky with Linus" (not lucy in the sky with diamonds)— Forrest
- i used to believe that in the i love lucy days, everything really was in black and white— allison
- I used to believe that the heart at the beginning of the I Love Lucy Show was made of real chocolate.— Krissa
- I used to believe that white people had white poop and that mine was brown because I was brownAnon
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne
- I thought snow had diamonds in it because it sparkles when the sun hits it.— Giselle