James at 2011-08-31 07:14:00:
I attended an event interview thing with Charlie Kaufman a few years back.
He mentioned that the script got around to John Malkovich while it was in development. He read it -- and immediately thought Charlie Kaufman was a stalker. Apparently he lived in apartment 7 1/2 and thought the 7 1/2th floor was in no way a coincidence.
Charlie's response was something like -- I must have been really tuned in to the, uh, cosmic, uh, collective unconscious or something. Because I had no idea.
Kaufman also sited this coincidence as a likely reason Malkovich agreed to not only lend his name, but be a part of the film.