I think that's the sad truth of most funny people - in fact,I think there's a quote attributed to Williams himself (though I don't know if he actually said it) that goes something like the saddest people are the ones who'll try the hardest to make you laugh. Something like that...
Yes, he was so great it Dead Poets' Society, the kind of teacher everyone longs to have, but few are privileged enough to.
Thank you for the comment, Nancy :)