People like to go on about Bill O'Reilly but he is far from the worst! Of course he is a far right wing hack who lies for money but at least he has some intelligence.
For me the biggest clown on Fox is Sean Hannity, he has me in stitches at times. The most brainless attack dog on the airwaves. Glenn Beck is without a doubt mentally unstable and always provides some good "infotainment".