The Pardoner's Prologue and Tale
The remaining two come up with a plan to kill the third when he comes back so that the money could be split between only the two of them. At the same time the third man has the same thoughts as the other two and wants to have all of the money for himself. So he went and bought poison and poured it between the two bottles making sure he kept an un-poisoned bottle for himself. When he got back the other two men jumped out and killed the third man. But in celebration they decide to drink the wine unknowing that the poison was still in the wine, the choked to death due to the poison.