If you like your boss, this question's a breeze to answer, you can sing their praises.

What if your boss makes Hitler look like a kindergarden teacher? You have NOTHING to gain by telling your interviewer that your ex or current boss is an asshole.

"My boss and I have a dynamic relationship. We're very different kinds of people, and although it was a challenge to start with, it's taught me to (insert a lesson or two here). I'm in a company to work, learn and grow. Can I ask if you have any personality challenges in this department?" Lessons to smart bosses are more important than the experiences.