It is incredibly rude to walk out during the middle of a song, but must we drag out the old, "If you don't LOVE Sondheim, you just aren't smart enough/don't want to think/haven't seen his shows enough times."
Oh wait, of course we must. Never mind. Carry on.
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll