I heard an apocryphal story about the RB67 once that the Japanese designers were shocked when after it's initial sales in the US that some US photographers wanted a grip for it. Since it was designed as a studio camera, they let absolutely no weight saving measures be designed into it, and only an American would hold it handheld, this demonstrated to some of the engineers why they had lost the war.
I always wanted to use it as a Paparazzi camera, thinking if anyone wanted to slug me they would have to get through 13 pounds of glass and metal first...LOL