One of the most interesting and important proofs in the history of mathematics is the Pythagorean school's proof of the "irrationality" of the square root of 2. After a brief look at G. H. Hardy (1941) thoughts regarding it, two versions of the classic Pythagorean proof are examined and discussed in this article, one written by an American professor (King, 1992) and the other by an Australian mathematician, author and lecturer (Arianrhod, 2003). A 16-year-old student of Vietnamese/Chinese background is asked to prioritise the versions--which version is easiest to understand? (Contains 1 figure.)