Brewster McCloud scene staged during Jackass: The Movie
In jackass: The Movie there is a scene when Spike Jonze appears as an old man in a wheelchair, along with a few other people. They pretend the chairs are out of control and they race down the street.
There's an almost identical scene in Brewster McCloud, when Stacey Keach (in old man makeup) is seen doing pretty much the same thing.
I bet Spike Jonze is big Brewster McCloud fan and came up with the idea for the bt with the wheelchairs. Now that I think about it, Brewster McCloud itself seems very "Jonzeian" in its oddness, surrealism, and unpredictability.
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