A woman is selecting from three men for a job in her team. She tells them that she has five hats – three white and two green. She explains that she’ll secretly put one hat on each of their heads, such that they won’t know their own hat’s colour. She says they’ll only be able to see the hats on the other two men’s heads, and also explains they won’t be able to see the two hats she doesn’t use. She ends by saying that the first man to correctly identify his hat’s colour will get the job. Man #1 looks at #2’s hat and #3’s hat, and says he doesn’t know his own hat’s colour. Then, Man #2 looks at #1’s hat and #3’s hat, and says he doesn’t know either. But Man #3 – who’s blind, so can’t see either of the other two men’s hats – says “In that case, I know my hat’s colour.” What colour was the blind man’s hat? And what logic did he use, so he knew he was definitely right?