If your last words are somehow meant to encapsulate your entire existence, Liz finds um strangely appropriate. Um means nothing. Um is what you say while you're thinking of what you'll really say. Um suggests someone interrupted before they'd begun. Um is a fifteen-year-old girl who gets hit by a taxicab in front of a mall on the way to help pick out a prom dress for a prom she isn't even going to, for God's sake.