Karaoke Psychosis

a alcohol induced mental affliction which beguiles the sudferer into believing that between his fourth rum and coke and his sixth trip to the men's room he acquired the ability to sing.

Although frequently associated with karaoke, the affliction can accur anywhere industrial quantities of alcohol are consumed, music is played, and assholes abound.

Suddenly he could sing everything better than the original artists like he was touched by a Muse, but he was just suffering from karaoke psychosis.