Hi . I play a bit of percussive guitar and youre pretty much on the money . If i have to do a percussive tap on the same beat i would play a note , I ' ll flick my hand in a way that the thumb strikes the E string as percussion while my other fingers strike the strings . <| sep |> well that is the usual practice . If you have a whole warehouse of bills , like in lethal weapon , you use fakes . If the Character takes a close look at one of the bills or uses one to light a cigarette , and you need a closeup you use a real one . Just like with anything in hollywood , the closer you go , the better the props have to be . <| sep |> I think our societies deliberate willful ignorance to avoid becoming informed about or looking at diet being a key factor in physical and mental well being is a big player here . It ' s the elephant in the room that nobody wants to see and possibly devalues studies such as this . You may be interested in the work of PCRM .