Don't you just love those CAPTCHAs!?
Turin test: 'The Turing test, proposed by Alan Turing in 1950, is a measure of a machine's ability to exhibit intelligent behaviour equivalent to, or indistinguishable from, that of a human. During the test, a human evaluator engages in a natural-language conversation with one human and one machine via a terminal; if the evaluator cannot reliably distinguish the machine from the human, the machine passes the test.'