I'm being realistic when I say that I have the job in the bag.
What makes you think you got the job?
I totally blew the interviewer away. I could just see it in his eyes. I am the best.
Maybe you thought that things went well in your interview, but not being realistic and getting your hopes up is a bad idea. Expectations like this lead to crushing disappointment when they don't come true.
At the end of the interview, I was told I would be his assistant.
Well if he told you you've got the job, I understand your optimism. But he still has to run that by other bigwigs in the company. The odds look good, but it's not a shoe in until you sign on the dotted line,