I heard there are people who memorise the Quran without knowing the slightest bit of Arabic?
And there's also the Kiwi chap, Nigel Richards, who memorised the whole French Scrabble dictionary in order to win the French world Scrabble championship, without learning any French in the process.
(Whether you call what he did to the French word list 'understanding' is up for debate, I guess. I am fairly sure he went much deeper into understanding the underlying probability distributions of letters in French words than most speakers, but he couldn't read a newspaper.)