How I Met Your Mother2005

Marshall:
No, it wasn't a cockroach, it had fur. And only mammals have fur.

Lily:
It was a cockroach.

Marshall:
Come on Lily, the only way it was a cockroach was if it was wearing the skin of a mouse it just killed.

Lily:
Oh my god!

Marshall:
Yeah, it had six legs, a hard exoskeleton like a roach!

Lily:
But it also had mouse-like characteristics, grey brown tufts of fur, a tail.

Robin:
So which is it, a cockroach or a mouse?

Marshall:
It's a cockamouse!

Lily:
It's a whole new species, the cockamouse.

Marshall:
And it's the size of a potato.

Robin:
So what now, a cocka-potato-mouse?

Marshall:
Don't make it sound ridiculous, it's a cockamouse.