I was feeling pretty comfortable in my theory that use of the phrase “for some reason” as a punchline originated in the Simpsons joke with Homer’s screenplay about “a killer robot driving instructor who travels back in time for some reason,” but then I found this bit in Martin Amis’ Money, in which John Self describes the book of short stories published by the possible screenwriter of his in-development film project:
Some months ago Fielding had sent me a copy of this chick’s first book, a slender album of short stories. Young Doris had apparently done all right for herself in the States. The underlined bits of the clippings which Fielding’s LA office had enclosed spoke warmly of her originality and offbeat erotic power. The book was called The Ironic High Style, for some reason. For some other reason, one of the stories was called that too.
Safe to say Homer’s contribution was more influential in getting the phrase over, but my eyes bugged out and I laughed pretty hard when I saw this antecedent.