A song is selected, people post one line of the lyrics and an image that illustrates that line. If there is a difficult line and no one can illustrate it or people don't like/know the song then you may switch the channel and start with another song. Starting in the middle of a song is allowed in that case. This is based on a screenshot of a thread on /b/ where Anonymous performed Enter Sandman with lolcats.
Now playing: Metallica: One
I can't remember anything
