For some reason, many people on my expat forums confuse 'lose' and 'loose'- I don't understand this as they don't sound alike.
When I started at grammar school I was thrilled by the English text books and read the whole of 'A Lower English Course' in a couple of nights. When the teacher was talking about figures of speech she asked us what we would call 'Ten thousand thanks' and I said it was a hyperbole - pronounced as Hyper - bowl. She corrected my pronunciation but said she was very impressed that I should know the word.
I was amused when watching a programme called 'Ladettes to Ladies' There was a truly awful woman who spoke with a plum in her mouth and she told them she was going to teach them proper 'pronounciation'.