"scream inside the Fist of the ape"

This is a reference to the iconic image from the 1933 film King Kong where Ann Darrow, played by Fay Wray, is snatched by Kong, who then climbs to the top of the Empire State Building.

Director Merian C. Cooper's promise to Wray that she would have 'the tallest, darkest leading man in Hollywood' is quoted at the beginning of Part Two of Gravity's Rainbow.