Actually, I think I misquoted
"In this town, we don't deal with people as they are, but as they are percieved to be"
In our particular discussion, it's how "right" percieves "left" and vice versa.
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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