Those who dance are considered insane by those who cannot hear the music.
You'll live to regret it, young fellow! Why didn't you go too? You don't belong here; you're no Baggins—you—you're a Brandybuck!' 'Did you hear that, Merry? That was an insult, if you like,' said Frodo as he shut the door on her. 'It was a compliment,' said Merry Brandybuck, 'and so, of course, not true.