The Angry / Scary Monkey Show
Angry Monkey (or Scary Monkey) is GIR's favorite show. The show is basically just a monkey in front of the camera with some funky music behind it, but it seems to be pretty popular overall because you see it frequently throughout the Invader Zim run.
Angry Monkey airs on Channel 6 and is often seen with flies, band-aids and he's occasionally seen picking his nose.
GIR refers to this show as both Angry Monkey and as Scary Monkey so I'm not sure which is the actual title.