<P> The origin of the custom may be in German folklore , wherein supernatural beings are thought to live in trees , and can be invoked for protection . </P>
<P> The origin of the custom may be in German folklore , wherein supernatural beings are thought to live in trees , and can be invoked for protection . </P>
where did the superstition saying knock on wood come from
where did the superstition saying knock on wood come from
German folklore
German folklore