Explain xkcd: It's 'cause you're dumb.
James appears to be an acquaintance of Randall Munroe who was credited as the inspiration for 18: Snapple and 107: Snakes on a Plane! 2.
He is referenced in 1360: Old Files.
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This may also be the same James in the title text of 950:_Mystery_Solved
where it is jokenly suggested it may be an alias for Jimmy Hoffa
-- or is the explanation simpler, like Jimmy is actually 'short' for James?