My friend got fired for saying this... your thoughts?

[Namiirei]

You always get a trap question in interview like this, or when you pass a test on a psy.

It's 50/50, you need to give the correct answer for the guy/girl. If you'r right, it's good. If he/she don't like your answer, then it's game over for you, the rest of your interview is useless.