I used to believe that in the Strokes song Alone Together, the line "Let him go, he gave up" was actually "Let him go, leaky fuck". Until about five minutes ago.
A childhood belief about misheard lyrics

others believed things like this
- I used to think that the song"Stayin Alive" said "Staying In Line" like at school when I was little. — MacKenzie
- I used to think that the line in the song "Life in the Fast Lane" was "Fights in the Bat Plane".Anon
- i thought the line "saving my face" from the KT Tunstall song of the same name was "shaving my face"Anon
- I thought the line in the song "more than a woman" was "four-legged woman".— boo
- I used to believe that a "punch line" meant a line of people waiting to dip punch from a punch bowl.— Sheila
- I used to believe that I would be paralysed if I sat on the floor for more than 20 minutes— bittergrass