another thing in Japan is that you can get arrested for self defence. Say if someone starts attacking you on the street, and eg. you punch back causing an injury, when you could have simply ran away and escaped, then you can get arrested and held for 23 days as a suspect.

So say if someone shoves you on a subway in Tokyo, do not ever shove back or do anything worse. Move away, get witnesses / evidence if you can, then report. (I've also witnessed an attacker try to exploit this rule, where they would intentionally injure themselves during the conflict and then claim that the defendant did it, so be aware of that)

Oh, and other things that can get you arrested:

- Not promptly returning someone's lost property such as a wallet. There was a case here in the newspapers recently.

- A review about a business that damaged their reputation, even if it was true (but you don't have 100% evidence). eg. "I got food poisoning from here". Be very careful what you post and say online as defamation laws are very different.

oh, and maybe not arrested, but get in trouble for: if you place your household rubbish into not your designated collection point, even though the point is the closest to your home. (Also don't get me started on the topic of sorting trash...)