Biggest Job interview Mistakes

I think that these top 5 job interview mistakes are definitely big mistakes. But to me the biggest job interview mistake is to act ininterested during the interview, or to not know much about the position you are interviewing for. If you don't know much about the position, it shows that you make think the job is beneath you, or that you really just don't care. If you do your homework on the position and make it clear that you have the right skills for that job I think you give yourself the best oppertunity you have to win that position.