The medical inability to allow a music playlist to run it's course without skipping many tracks every few songs. Widely acknowledged by doctors to be a natural signal that you need to invest in new music/lay off the juice.
One man to another:
Man#1 "Woah man, your msn keeps changing what song you're on every 3 seconds. My eyes are beginning to hurt."''
Man#2 "I'm sorry . I just can't seem to settle on any one song anymore, I think I'm developing skipzophrenia."
Man#3 "Dude, you need to get some new music. Want the latest prodigy album?"