paper fan for slapstick; harisen
A large paper fan used in Japanese comedy (manzai, owarai) to hit a partner for a loud slap sound; also used as a prop by audience members. Compare 張り扇 (はりおうぎ), a similar fan used in traditional storytelling.
See also: 張り扇
In the manzai act, the funny man got smacked with a harisen by the straight man.
There was an audience member waving a harisen at the comedy show.