Heads I Win, Tails You Lose

“But if you have faith still in the words of Lord Shiva, my dear king of the demons, then why don't you make an experiment by putting your hand on your head? If the benediction proves false, then you can immediately kill this liar, Lord Shiva, so that in the future he will not dare to give out false benedictions.” (Narayana in the guise of a mendicant speaking to Vrikasura, Krishna, The Supreme Personality of Godhead, Vol 2, Ch 33)