Who: Neil Blumenthal, co-CEO of Warby Parker Why: Quirkiness and fun are core values at Warby, so Blumenthal uses this question to gauge cultural fit. "The point isn't that if you haven't worn a costume in the last four weeks, you're not getting hired," Blumenthal told Bryant. "It's more to judge the reaction to that question. Are you somebody who takes yourself very seriously? If so, that's a warning sign to us. We want people to take their work seriously but not themselves."