I'm almost sure that most people will pick 'I just threw out the love of my dreams' sang by Rachel Haden, so to stop that from happening it has to be a member of Weezer, past or present.  For me it's probably 'It's Easy' (sang by Brian) from Red Deluxe. And I think 'King' (sang by Scott) deserves an honourable mention, it's really grown on me lately.