This inkblot from out of the blue
Is an octo with nothing to do
Seen in Citizen Kane
It seems not quite germane
It's a stock shot from old Fu Manchu.
From Mr Cairns: "A shot of a fake octopus in Citizen Kane's newsreel sequence, representing part of Kane's private zoo, is stock footage lifted from The Drums of Fu Manchu." The frame used above is from the same footage, but was grabbed from yet another film that reused it--Ed Wood's Bride of the Monster! David wrote about all this, as well as edited a short film mash-up of it, here on Shadowplay.