What are some good messageboards?

Messageboards with intelligent, mature conversation.  Just... some place that a good concentration of non-stupid people.  Where can I find such a place?  Where are you, elusive messageboard?

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LOOK BUSTER SINCE I AM A MATURE CLEVER PERSON, DISPITE BEING 15 YEARS OLD, THAT MEANS I WONT THREATEN TO KILL IF YOU DONT GET GET OFF MY CASE!!!!!!!

BUT YOU ARE REALLY MAKING ME ANGRY WHITE BOY!!!!!!! SO BEWARE!!!!!!!!!!

I GOT A IQ OF 160!!!!!!!!!!! I GO TO MIT!!!!!!!!!! I DONT SUCK AT CHESS!!!!!!!!!!! I GOT A LOT OF SMARTS SEE????????????