  In Davidson's famous example, someone alerts a burglar by illuminating a room, which he does by turning on a light, which he does in turn by flipping the appropriate switch. According to the Davidson/Anscombe thesis above, the alerting of the burglar = the illuminating of the room = the turning on of the light = the flipping of the switch. And this is so despite the fact that the alerting of the burglar was unintentional while the flipping of the switch, the turning on of the light, and the illuminating of the room were intentional. Suppose now that it is also true that the agent moved his leg by trying to move his leg in just that matter. Combined with the Davidson/Anscombe thesis about act identification, this implies that the agent's act of moving his leg = his act of trying to move that leg. So, perhaps the act of trying to move the leg doesn't cause the act of moving after all, since they are just the same.