There is this song by Avril Lavinge called Complicated. I loved the song, but I made a major mistake on a lyric.
Actual lyric:
"Your never gonna find me fakin'"
What I thought:
"Your never gonna find your bacon."
Yikes, big mistake. =X
A childhood belief about misheard lyrics

others believed things like this
- I always wondered why shepherds washed their socks by night. (correct lyric: watched their flocks)— MaggieNJ
- A common misheard lyric in BMTH’s ‘Shadow Moses’ is “THIS IS SANDPIT TURTLE!”— Oli
- I used to believe that when I went to the mountain I would find an ancient monster or find some treasure— Yazer Solorzano
- My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- i, too, thought my grandma made up the bushel and a peck song. :)— nessa