there are a lot of people like that, and i know that i for one, often have marks that don't correlate with the amount of effort i put in. Eg, i wrote half my english essay for one of my advanced modules in the morning and then somehow, i fluked a 19/20. That said, i wouldn't mind shaking their hand either if they don't flaunt about their intelligence and make you feel dumb for having spent 3 hours trying to learn something they mastered in 10 minutes.
i've done a grand total of 1 hour study today, after a very decent 4 and a half yesterday
(pats own back)