This is an area where being decent at deflecting into a personal area of expertise can be really effective. And sometimes it doesn't require a deflection - if

This is an area where being decent at deflecting into a personal area of expertise can be really effective. And sometimes it doesn't require a deflection - if someone asks me about my favorite data structure, it's easy to go on for fifteen minutes about the beauty and utility of either union-find or Voronoi diagrams.