Musing: Should I knock on Wood?

The impulse to say "knock on wood" after certain types of sentences is very strong in me.  But lately I've been feeling like rejecting the impulse. Listen as I try to muddle through it. From Wikipedia:"Knocking on wood (also phrased touching wood) is an apotropaic tradition of literally touching, tapping, or knocking on wood, or merely stating that one is doing or intending to do so, in order to avoid "tempting fate" after making a favorable prediction or boast, or a declaration concerning one's own death or another unfavorable situation."