Can we gather to discuss answers to some unusual interview questions?

What interview questions surprised you/you find difficult to answer/weird/unusual and how did you answer them?

My friend was once asked „what do you have that other candidates and residents do not?” and struggled to answer. He told me „well if I said I’m smart or basically any good trait, it’s making the candidates/residents sound bad. He messed it up because he said he is just like them.