There are some beliefs which are founded on sound reason but over the years na-distort. Like yun pag mag sign of the cross most of the people ay dinidikit yun back of the thumb sa baba. Its a totally wrong concept dahil hindi nakikita then ng mga servants ng mga Kastila yun hinahalikan yun cross ng rosary kaya akala nila yun thumb lang dumidikit.

It is not wrong to have such superstitious belief as long as its nothing that affects your everyday life.