central tenets of the puzzle is that for a reasonable person There is reasonable grounds for that person to intend to drink the toxin, since some reward may be obtained. Having come to the above conclusion there is no reasonable grounds for that person to drink the toxin, since no further reward may be obtained, and no reasonable person would partake in self-harm for no benefit. Thus a reasonable person must intend to drink the toxin by the first argument, yet if that person intends to drink the toxin, he is being irrational by the second argument. See also Doublethink Prisoner's dilemma References External links Levy, Ken (2009). "On the Rationalist Solution to Gregory Kavka's Toxin Puzzle." Pacific Philosophical Quarterly 90, 267–289. Decision-making paradoxes Puzzles Thought experiments Thought experiments in philosophy