I got my job because I've been myself. As soon as I laughed with the interviewers I knew I got it.

They choose you for a interview out of all the other CVs because they hope you know your stuff. Proof it! And most important - show your character. Don't be a blank paper! Make fun with them. Or at least leave some kind of positiv impression.

The funny part:
I applied for jobs in Austria while doing my Bachelor degree in the UK. Over Skype they had no idea I was wearing sweatpants.