Disclaimer: I totally got permission to post this! I asked my wife!
This is a true story. My wife did not grow up in the US, and English is her second language. This is the first memory I have of her winging a pronunciation.
She was reading a book to a small 2-year-old boy we were baby-sitting, plowing through the book until she got to a certain dinosaur she had never seen in English.
“This fearsome dinosaur is called…” pause “Dinojuju?”
I started laughing and the look on the 2-year-old’s face was priceless. We’ve laughed about that one ever since.