Experimental economics frequently deals with trust and reciprocity, even in short-run interactions. Yet, most of the time, the experiences investigate in a predefined framework whether people tend to trust other people and their potential investment is paid back. This paper will investigate if adopting a strategy aiming at changing the rules of interaction for the benefit of the other individual could be advantageous. The question is not any more to know if it is reasonable to have confidence but it rather becomes how to act in order to inspire confidence to other people. Then a very simple experience based on Tversky and Shafir analysis will try to check if securizing the expections of the other person can lead to the developement of behaviors more based on cooperation.