The art of karaoke is a musical form especially designed for grown up people to make a complete ass out of themselves. Requirements are; a microphone, a tv-set, a recorded song stripped of its lead vocal(s), an audience, a victim and lots, lots of alkyhol. Especially for the audience.
Even though most karaoke singers are functional illiterates the lyrics are shown and highlighted while the victim tries to sing or slur along.
Karaoke is in particular popular in North Korea where foreign visitors are slowly tortured into obscurity with songs as "Let's Farm Well This Year as Asked by the Rural Thesis". More fascinating karaoke songs can be found here.