Freud proceeds to look for "evidence, for the existence of hitherto unsuspected forces 'beyond' the pleasure principle." He found exceptions to the universal power of the pleasure principle—"situations ... with which the pleasure principle cannot cope adequately"—in four main areas: children's games, as exemplified in his grandson's famous "fort-da" game; "the recurrent dreams of war neurotics ...; the pattern of self-injuring behaviour that can be traced through the lives of certain people ["fate neurosis"]; the tendency of many patients in psycho-analysis to act out over and over again unpleasant experiences of their childhood."