The Krazy Taco
The Krazy Taco commercial shows up periodically throughout the Invader Zim series, but the most memorable Krazy Taco commercial has to be the one which mobilized the GIR house in Invasion of the Idiot Dog Brain..."Must obey the taco man!"
You won't find a crazier taco than the Krazy Taco!
The restaurant also spawns one of my favorite Zim quotes - "Shut your word hole, Taco human!"