According to thin skull rule in common law accused must take his victim as he finds him. This accepted by Iran and common law legal system with respect to child, old and who suffers from physical and mental disorder so that their weakness is considered in the imputation of bodily harms to accused. It means that accused must consider his victim’s voluntarily and involuntarily reaction. This rule is accepted just about by two law systems in the scope of automatic physical act and psychological reactions of victim and even on the ground of necessity or duress. But in the case of the victim’s unreasonable voluntarily reactions resulted from his or her belief, the rule has been accepted in Blaue1975, nevertheless it was subsequently interpreted differently by lawyers. In Iran law according to Islamic jurisprudence and positive law the imputation of the result to the accused in this situation is doubtful and can not be accepted.