To discipline in a rakugo, a kodanshi pats his/her own head with a Sensu or a master pats his apprentice on his/her head with a Sensu rather than with the hand.
落語で自分の頭を叩いたり、踊りの師匠が弟子をたしなめるのに、手ではなく扇子を使って頭を叩く。