I had no idea what Pinkberry was when I started watching The Hills. I eventually figured out from Gawker and Defamer, but This New York Times article does the best job of explaining the phenomenon. My favorite part is the quote from the owner of (the kosher!) one of the alleged knock-offs:
"'I don’t think we’re the same,' said Uzi Moses, the owner of Berri Good. 'We use different fonts.' On top of that, he said, 'You know we have celebrities here, right? Are you aware of that?'"
Comments