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Not sure if this was ever answered, but does anyone know where the nickname big puma came from? Seems like I've only heard it this year and fairly recently too...
I believe the guys on the morning show for 610 AM, John Granado and Lance Zerlein, gave him that name. I'm not certain, but I think it was in response to someone (a caller, perhaps) saying that Berkman is not built like an athlete. Having listened to the show fairly regularly over the last several years, Lance Zerlein probably went into one of his diatribes on how Berkman is built like a big puma, and it went from there. I still hear them having fun with it from time to time and when he's on, Berkman participates as well.

And as Speedy mentioned, that "Leave Lance a message" program was hilarious.