My most favorite song by Elton John, "Someone Saved My Life Tonight", was one of many songs I sang wrongly.
In one verse, I sang "And stricken by a harlot's social scene, just a pawn I paid five dollar and eighty quid", when it was "I'm strangled by your haunted social scene, just a pawn out-played by a dominating queen."
...Luckily I now have a book of lyrics to help correct me.
A childhood belief about misheard lyrics

others believed things like this
- I used to think the lyrics to Elton John's Tiny Dancer were "hold me closer Tony Danza."— kstawitz
- My friend used to believe that the lyrics to Elton John's "Tiny Dancer" were:
"Hold me closer Tony Danza"— I'm with stupid - I used to believe social security ensured you would always have friends— Stephanie Pardi
- I thought that socialism just meant being social and didn't get why anyone would be against it!— Olcasgean
- As a child I used to think that Olivia Newton-John and Elton John were married.
Boy, I was way off.— Lisa - Billy Squire sang about "My Kind of Lover". My wife sang about "My Candelabra"— Wailerman