How to avoid working for a douchebag

"It just takes a single question to be quite effective at filtering out the douchebags from the rest:"

  "As a manager, what do you do to help
  your programmers do their job better?

Indeed. If anyone I was interviewing had ever asked me that question I could have talked for at least a couple of uninterrupted minutes. And it's pretty clear plenty of the ... subpar managers I've worked for would have failed it for one reason or another.