I had a bad experience with him a couple years ago. I was invited on the show to talk about some aspect of the 9-11 conspiracies (I think it was WTC-7). As it happened, they wanted me on at something like 4:30 AM my time, which I griped a bit about to the producer. He warned me not to mention that part, that Mancow feels that it's such a privilege to be on his show that any minor inconvenience like getting up two hours before the sun should be ignored. Further, I should be peppy and upbeat. So I actually showered before the appearance and had a cuppa to wake me up. No kidding, he gets me on the air and asks me if I'm getting paid to blog at SLC. Peppy and upbeat, I respond with something like "No, but I do get the employee discount at the New World Order Store."
Zap! I'm off the air and the producer says, well, I guess that's it. But they call me back two minutes later saying he still wants me on the show. So I sit on hold for 45 minutes, at which point he brings me back on, asks me maybe 2 questions and then I'm done.
Definitely on my list of shows I will not appear on again.