I've gotten the job from all the interviews I've had, but I think I've lucked out on that statistic, because I don't think I'm actually that great. I usually come in saying something like "geez it's cold, huh?" or "parking's a nightmare around here, hey?" as an icebreaker. Far too many interviewers I've had just jumped straight into it. If I force the icebreaker, it helps with my confidence.