In reality?

You spend the entire interview being friendly, likable, and at ease while fluidly and competently answering the interviewer's questions.

I know that sounds like a trite answer, sort of like the How to Draw an Owl instructions[1]. But interviewing is something you can practice for and become good at. Or at least better at. There are quite a few good books on the topic.

That's not to say the candidates you're competing against won't also be likable. But I've interviewed lots of developers over the years, though, and if you're a developer who is competent technically who also interviews well, you'll be far ahead of most of the people you're competing against.

[1] http://knowyourmeme.com/photos/572078-how-to-draw-an-owl

By being good at what you do, not by giving cute answers to retarded questions.

Sure, but unless I hire all the candidates and compare them after a week, I have I rely on some fallbacks.

That's why you have interviews... use them wisely instead of asking silly questions.

Yes, there are a multiple candidate, 8 peoples including me.

I'm the only one from my country that apply for this position (how do I know? they tell me).

This interview process, is not the first process. before the interview, there is a "skills assessment" session, that I am passed.

The fact that they tell you how many other candidates there are for the same position is a bad sign about their hiring process to be honest.

I don't see this is a bad sign, they told me, because I ask.

I have to know how many candidate left. Sometimes that can motivate you (for me of course).

Why is that?