Back before Joe Rogan was a commentator for UFC, before he became famous for creating Fear Factor, he was a comedian. I first heard this bit on the Howard Stern Show. If you're offended by raunch, don't listen, because this is extremely off-color:
Rogan's exaggerated Boston accent and portrayal of a macho guy in denial are near perfect.
Next time you hear Rogan announcing a fight, think of this.