Consider the following exchange, which actually took place while watching the trailer for "Get Him To the Greek" a.k.a. "Let's try to Duplicate the Excitement of The Hangover":
Katie: What's that guy's name again?
Greg: Huh?! Well, it's currently Diddy, I think. I think Sean Combs works as well...
Katie: Umm...
Greg: But if you're really asking, it was Puff Daddy first. He changed it like 43 times. Both "Puffy" and "Puff" I think were completely acceptable and maybe even interchangeable -- don't know if they still are -- but I think that would be more like if you knew him personally...
Katie: Uhh...
Greg: like Mase or something. But that was back when he was actually rapping. Around the time he stopped, I think he went to "P. Diddy," which apparently was too long and got shortened to "Diddy." By the way, he's always a great Letterman guest -- it's hilarious when Dave introduces him. So I think to be safe, just go with "Sean" or "Diddy."
Katie: No. The British guy.
Greg: Oh. Russell Brand. ... Sorry.
