Futurama, Season 1

Farnsworth:
It's a sunny little doomed planet, inhabited by a number of frisky little doomed animals.

Leela:
Animals?

Farnsworth:
That's right. Animals in desperate need of rescue. You see, Vergon 6 was once filled with a super-dense substance known as dark matter, each pound of which weighs over ten thousand pounds.

Leela:
Wait! What about the animals?

Farnsworth:
Well, dark matter is extremely valuable as starship fuel. That's why it was all mined out, leaving the planet completely hollow.

Leela:
Yes, but what about the animals?

Farnsworth:
The wha?

Leela:
The animals.

Farnsworth:
I didn't say anything about animals. Now it seems that the planet will collapse within three days. Incidentally, this will kill all the animals.