It is considered a crime in Cyrodiil to hit a person with a fish. It is, however, not considered a crime to hit a fish with a person.

Joke and fake loading screens and screenshots from The Elder Scrolls IV: Oblivion, run by @ChrisOfTheDead.
General links and the actual Oblivion mod made from these jokes in my Carrd page:
It is considered a crime in Cyrodiil to hit a person with a fish. It is, however, not considered a crime to hit a fish with a person.