There are countless ways to mess up a job interview, and it can be hard to keep track since every hiring manager is looking for something different. Some workplaces prefer transparency, they want to joke with you right off the bat and get a feel for your workplace banter. Others, want you to stick to the script, sell your professional skills and cut the conversational fat.
There are scenarios in which putting forth a bit of cockiness can catapult you to the top, and other times where subtleness and humility are key. If you've ever been on the job search for longer than a few weeks at a time, then you have a deep knowledge of how confusing it can be to navigate the interview process.