Is there proof that that kind of behavior actually brings about good results? I think it might just be a myth. The quote is from a rant about some written application where the applicant sounded too full of himself. But I think such things can also backfire. It isn't at all obvious to me that who boasts the most is the most likely to get the job.

Although I admit there are studies that show in groups people tend to trust the people who claim they know the most.