Because 11 is higher than 10 right?? Love that movieI like movies. There are alot of movies out there where certain lines and how they pronounce it in the movie get into every day language (at least in the US) and the translation gets lost on alot of people (me inc.) Like alot of people don't know were turn it up to 11 comes from (I am smug, one of few movies were it came from and actually saw the movie)
Either way, the average person (inc. me) won't get the reference other than he was trying to be funny/cute when it was saying syllable.