Karaoke fever

The addiction of going to karaoke events, whether as a performer or strictly as an audience member. Usually contracted unexpectedly after attending karaoke night a single time, probably with very strong encouragement from a friend the moment they heard someone they knew was ‘curious’ about it.

Friend 1: I’ve got a fever, and the only prescription is more karaoke!
Friend 2: sounds like you’ve got a severe case of karaoke fever.