I misheard 'she just smiled and gave me a Vegemite sandwich' in 'Down Under' by Men at Work. Not having heard of Vegemite then I thought it was a 'bitumen sandwich'. I still annoy my husband by deliberately singing this version whenever it comes on the radio.
A childhood belief about misheard lyrics

others believed things like this
- I used to think mayo was sandwich glue and u had to have it to keep it togetherAnon
- I used to think you had to be in a special club to get a Club Sandwich.— Louis
- I use to believe all the people singing on the radio were IN the radio.— Yvonne
- I used to think tiny little people were inside my mothers radio singing to me.Anon
- I could never work out how they used to change the bands over so quickly when i listened to the radio— graham
- I used to believe that arson was a flammable liquid, not the act of deliberately setting fires.— Joey Schwartzman