In the movie What Women Want I came across the expression "a rock saw of shooting beer commercials".
Here's some context from the movie:
While we’ve been getting a rock saw of shooting beer commercials with the Swedish bikini team, the industry’s been transformed. We were the agency in town ten years ago. Now we’re struggling to be third. If we don’t evolve and think beyond our natural ability, we’re gonna go down.
What is the meaning of the expression "a rock saw of..."?