I totally agree that 'fit' is at least as important as technical acumen. To that end, I try to create a scenario during an interview with a candidate where I intentionally make an incorrect statement about something technical, to see how they go about correcting me. If I see overly aggressive, defensive, or arrogant behavior, I cut the interview short and move on. I'm looking for an open mind, an ability to debate and discuss professionally, and some humility.