I'm going Cavs on this one, they literally do a demonstrative show on every whistle. Varejao has never seen a call he likes, and their fans just buy into it no matter how lame the argument is.
But yeah, Lakers are up there...what can you say, it's obnoxious cause it shows a sense of entitlement, but it seems to work. Refs seem to get concerned that attention is being drawn to their calls and they start to call the game accordingly.