"I'm A Small Thing" by zim-182 (Actually, it's by me, Invader Xat, but oh well!)
(To the tune of "All The Small Things" by blink-182)

I'm a small thing, Purple told me while Red grinned
They sent me here, to Irk Earth's not near
I wish I'd know
Why they're glad to see me go
Now I'm here, there's Dib
Stu-pid lil' Earth-pig
Dib is my foe, I hate him so, turn your jets on, carry me home!
Late night, come home
Earth sucks, I know
GIR left a mess down in my lair
Intelligence from him is rare
Dib is my foe, I hate him so, turn your jets on, carry me home!
Keep your head still, this chip'll help you chill, oh it'll never work, GIR you're junk-filled!
Dib is my foe, I hate him so, turn your jets on, carry me home!
Keep your head still, this chip'll help you chill, oh it'll never work, it'll never work, GIR you're junk-filled!