PZK
I think you can not count the vibe you get from the interviewer. I thought that I impressed the interviewer and I was 100% sure that I am in

Now it is Wharton or NOTHING!!!!!!!!!
Totally agree. One of the most nonsensical questions you can get asked by friends/family/co-workers is "how did your interview go?"
WHO KNOWS?!!!
My interviewer at Ross was totally poker faced. I even tried to whip out my most impressive stories and achievements...the guy never cracked a smile, frown, lifted eyebrows, nothing! At the conclusion of my interview I had NO IDEA how it went. As of about 2 hours ago I assumed it went horribly but apparently it was acceptable after all.