I had a tutor who would make you write an essay for a seminar to read out to the group. He was a stereotypical Jewish guy from the Bronx with a very thick accent and he would verbally tear the essay apart as you read it. Anyway, one seminar he was saying nothing I felt quite good about myself until he shouted 'Stop, Stop, Stop ya killin' me (yes, he really said this) where did you get this crap from?' I smiled and referenced his book as if it was a footnote on an essay. He wasn't even embarrassed, just told me to carry on.
Another thing on the whole unprepared thing. I did my entrance exam for Aber after a heavy night out, not intentional, my school decided to tell us on the morning. I decided to talk about British war technology between the wars....I spouted on for 2000 words about Churchill tanks and Spitfires, and lo and behold I got the letter saying I had a unconditional offer. I think its the relaxation effect because you think you haven't got a hope in hells chance.