 Another example, due to Gibbard (1981, pp. 235–6): of a glass that had been held a foot above the floor, you say (having left the scene) “If it broke if it was dropped, it was fragile”. Intuitively this seems reasonable. But by Hook’s lights, if the glass was not dropped, and was not fragile, the conditional has a true (conditional) antecedent and false consequent, and is hence false.