I used to think in the song Hotel California, it was 'We are programmed to deceive', as well as 'She got the Mercedes Benz instead of "bends" (which is the correct term).
A childhood belief about misheard lyrics

others believed things like this
- I thought the song Hotel California by the Eagles said "Welcome to Oakdale California— JewLea
- I saw this guy at a hotel and he wore a tag that said "trainee," so I thought that it was his name!Anon
- I once thought a vent in my hotel room led down to the center of the earth.— flarn2006
- i used to believe the sunset was better in California cause it was closer to the sun— hazel
- I used to believe that California was my house, not the state I lived in.— Katie
- I used to believe that the term "being mugged" meant someone beat someone else with a coffee mug.— Matt Thiel