"Willbedun" - I just coined that word. A willbedun is somewhat like a Mondegreen but instead of mishearing a word of phrase the meaning of a word is changed out of pure ignorance.
As a definitive example, when I was a kid I was raised in a culture where the second person singular was never used. Therefore, I confused it's different forms and used the meaning "Thou" for the word "Thy".
Now this might not seem too drastic a mistake but it makes a whole shitload of difference when reciting The Lord's Prayer and "Thy will be done" assumed the meaning "THOU will be done". It wasn't until I learned my mistake that I was able to keep a straight face during The Lord's Prayer.
SO I'm throwing this open to the floor and asking if anyone else has any personal "Willbeduns".