design company and the guy at the interview asked me this riddle. Three men are in a dark room. There is a bag with 5 hats, 3 are white 2 are black. The first guy looks at the other two hats and doesnt know what he's wearing, the second guy looks at the two hats and also doesnt know what hes wearing, the last guy who happens to be blind says he knows what hat hes wearing. How does he know? Thought it was funny that it was part of the interview.