While this is just a practical joke now
consider the same thing patented in 1950s. How would that affect the developement of programming?
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This guy's ahead of his time! He's using quantum programming methods: in universes where invalid data is passed to this function, it does not return. Thus you are ensured that you will only have valid data after calling it. Optimally you'd destroy the universe on failure, but computers haven't quite advanced to that level yet.
-- [link|http://thedailywtf.com/archive/2004/10/26/2920.aspx|The] Daily WTF