i never heard of that...seriously.
the only thing that comes close was a guy that was my roommate in undergrad--constantly stoned and i don't think he ever went to class. ended up being the class valedictorian and winning a fellowship in Oxford after graduation.
but i think medical students are way too competitive to be this laid-back. meaning, even if they are really smart they're always worried about someone being smarter than them. i was a relative slacker these past two years--especially second year, when I studied for some block exams two hours before the actual thing (and passed!)...but now, I try to put in a lot of my time to study well, because I really, really don't want to retake the boards.
Besides, you'll be surprised how many things you forget. Even if you do well in your first 2 years.