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That does not compute.
—— Julie Newmar as AF709, the robot from the U.S. television series My Living Doll, 1964
Most of you have probably seen old science fiction movies or television shows in which a computer, unable to process some irreconcilable paradox, utters a variation on the above phrase, often followed by some kind of meltdown or violent self-destruction. Thankfully, our web applications don't cause servers to belch smoke and flames when an error occurs!