harisen is a Japanese slapstick comedy fan. It’s a classic comedy prop. The 'straight man' (tsukkomi) uses it to hit the 'funny man' (boke) when they say something silly. It makes a loud noise but doesn’t actually hurt.For an example of its use, see episode 3 of "Kaguya-sama: Love Is War?" とある事情で日本のTVから姿を消してしまったハリセンであります。そのうち「ハリセン？なにソレ」という世代が増えてくるのでしょうね。

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