Tiny thing I've had laying around for a while. Enjoy!
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(GIR is standing in the front room on the upper level of Zim's base. A microphone is in front of him. He begins to sing.)

GIR: "M" is for the Many things I've broken,
"A" is times I've made you Angry-- There's lot's there!
"S", Se-cur-i-ty breaches that I've caused,
"T" is Times that you've pretended not to care.
"E" is for the Earth you want to conquer,
"R" is Rubber piggies that you gave, (wipes away a tear)
Put it all together, it spells "Master",
And any way you spell it, I'm your slave!

Zim: (Hiding a smile) GIR, that was the most pointless piece of filth I've ever heard.

GIR: Aww! (Winks) He likes it!