愉ゆ快かい犯はん

noun

crime committed for fun; criminal who enjoys the reaction

Refers to both the act and the perpetrator; often used for crimes like vandalism, hoaxes, or cyberattacks where the motive is amusement or attention rather than material gain.

• 警けい察さつはこの事じ件けんを愉ゆ快かい犯はんの仕し業わざと見みている。

  The police believe this incident is the work of a criminal who did it for fun.

• 愉ゆ快かい犯はんによるいたずら電でん話わが相あい次ついだ。

  There was a series of prank calls by someone who enjoyed the reactions.