The Grunka Lunkas are small orange men who inhabit the planet Wormulon. They are employed by the Slurm Worms to work in the fake slurm factory. They spontaneously burst into song with a warning about asking questions of Glurmo. They aren't paid to sing and Glurmo denies them their bathroom break for singing when they should be working.
They try to sing again later but are repeatedly silenced by Bender and Glurmo.
Grunka Lunka Song
Grunka Lunka dunkety doo
We've got a friendly warning for you
Grunka Lunka dunkety dasis
The secret of Slurm's on a need-to-know basis
Asking questions in school is a great way to learn
If you try that stuff here you might get your legs broke
We once found a guy face down in the Slurm
It could easily happen again to you folk
So keep your head down and keep your mouth shut
Grunka Lunka Lunka dunkety dut!
Leela: Is it the secret ingredient?
Grunka Lunka dunkety dingredient
You should not ask about the secret ingredient!
Bender: Okay, okay, we get the point.
Leela: I was just wondering because of the armed guards.
Grunka Lunka dunkety darmedguards....
Bender: SHUT THE HELL UP!
- The Grunka Lunkas are based on the Oompa Loompas in Charlie and the Chocolate Factory.