Play word 合の子弁当 合の子弁当 あいのこべんとう children's lunch box of cooked rice and a Western-style side dish (popular late Meiji and Taisho periods)
Play word 四当五落 四当五落 よんとうごらく sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams)
Play word 耳当 耳当 じとう earplug (traditional jewellery worn in the earlobe, popular in Han dynasty China)
Play word 鞘当て 鞘当て さやあて quarrel between two samurai due to an (accidental) clash of sheaths while crossing paths