In his paper Freedom to Act, 1973 (reprinted in
his Actions and Events, OUP, 1980) Davidson explores
the question of how, exactly, "attitudes must cause
actions if they are to rationalize the action".
He introduces the case of a climber who wants to be
rid of the weight, and consequent danger, of being attached
to her partner; and who believes that letting go of
the rope will so rid her. The want and belief unnerve
her, and she accidentally lets go of the rope. So although
the belief and want cause the action, but they don't
seem to rationalise it.
(Thanks to Bill Child for this entry.)