When have you seen or heard statistics used inappropriately?

Statistics is needed at every stage of the research beginning from planning to the end, in order to gain scientifically importance and to obtain reliable results. The use of the inappropriate statistical method, technique and the analysis cause time and cost lost and most importantly thinking in the way of scientific ethics, it gives harm to science and humanity. Even if the study is carefully planned to conduct as a result of applications with errors, the misleading results might be obtained. That leads other mistakes who take as a reference to those studies.