Apparently the exploding cigars were just the beginning. The U.S. has tried to kill Fidel Castro 638 times, or so says one of his former security guys. Many of the planswhich might have been taken from the reject pile of Wile E. Coyotenever got off the drawing board, like this classic:
Knowing his fascination for scuba-diving off the coast of Cuba, the CIA at one time invested in a large volume of Caribbean molluscs. The idea was to find a shell big enough to contain a lethal quantity of explosives, which would then be painted in colours lurid and bright enough to attract Castro's attention when he was underwater.