First of all, I don't think Joe Flacco really believes he's the best. I know there's that professional pride, and that's why things like "Who's the best QB?" aren't decided by the quarterbacks themselves. I think Flacco was giving the answer he thinks he's supposed to give -- and one his teammates want to see him give, as well. It wasn't a knee-jerk response to the query, rather a well-thought out "When I'm asked this question, this is what I'm going to say."