It doesn't have to be funny. If he gets any kind of thought in his head, original or not, he repeats it. Over and over and over, ad nauseum. It's the only way he can fill the ten minutes of air time out of every twenty before the next SportsCenter update.
He really made a great point when someone e-mailed him a while back complaining that Lenny P and Gazoo were ripping on the Bills' hiring of Levy because they're just Donohoe cronies. He said he was going on air to "defend" his ESPN mates. His only defense, however, was cracking jokes about how old Levy and Wilson are.
I now prefer riding to work in silence in my car than listening to this jackass.