Heard the other day:
"That's one boy that I woulda sued his ass a long time ago, if I was her."
Note that the relative clause is formed with a "that" and an unshifted pronoun (here, "his"), instead of "one boy whose ass...".
I've been hearing more of these "that"+pronoun relativizations lately. I think they used to be used only under circumstances where there's really strange stuff happening already, such as would disfavor normal relativization structures, like "That's the guy down whose street the criminal didn't know he was driving" <=> "That's the guy that [or even "where"] the criminal didn't know he was driving down his street".
This use of "that"+pronoun often sort of grates on me, but I have to admit that it's much tidier that the currently conventional "correct" way of doing very complex relativization. I doubt that it'll ever overtake simple relativization like "Here's a movie that I saw last week". With "that"+pronoun use, you'd expect "Here's a movie that I saw it last week", but I don't think that'll ever be acceptable.
Other thing I hear lately, which I hate in all possible ways, is when relativization of a prepositional object ends up just dropping the preposition. Like: "That's the guy whose street the criminal didn't know he was driving." The "down" is gone, vanished into hyperspace. This displeases me.