The version I got in an interview was, "What's your favorite algorithm?"

I stalled 30 seconds, pulled Lottery Scheduling out of my ass, and proceeded to do pretty well on the interview, then be told that they wouldn't hire me because they could tell I'd go to graduate school.

If you're ok with someone pulling an interesting story from memory rather than actually computing a total ordering on bugs or algorithms for "best", these questions work very well.