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I'll have to agree with you on Lewis Black - his "always near a heart attack with rage" schitck is hilarious, IMO - and he's intelligent enought to make some great points with his humor.

Another one of the same calliber is Bill Hicks- full of rage, filthy, and hilarious.

Exactly the opposite but incredibly funny is Steven Wright- deadpan delivery of mostly one-liners that are so twisted they make you bust up at their outrageous outlook.