GaryK - 1:40 am on Jan 8, 2013 (gmt 0)
It is impossible to make anything foolproof, because fools are so damned ingenious.
This reminds me of a quote I like:
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Rick Cook, The Wizardry Compiled