The act of playing completely unrelated songs, sometimes just to hear a particular part of a song, and then quickly changing to a different one.
This happens for example at parties when some idiot gets his/her hands on spotify or youtube.

Tune Zappers have a tendency to get very defensive and will not give up easily their position of "self-elected DJ".

They have to be kept away from the source of music at all costs.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.