Actually that's the strange thing. She's learned not only the specific funny quotes but she uses them in situationally-correct instances. When crashing two cars together, "Buckle your sphincters!". When I pull her out of the tub and she can't see because her massive amount if hair is in the way, "My lawyer will hear about this!" When she wants to make us laugh she puts both her claws up in the air and goes for a Zoidberg scuttle.
I've had to defend the fact that I let a three year old watch Futurama many a time. Mostly to people who would rather I show things like Dora (I don't like my kid yelling at the TV) or movies like The Little Mermaid (truly horrific from viewpoint of relationship modeling). Admittedly sometimes my kid walks around quoting Bender "Ass Ass Ass Ass Ass!" and it might one day get sent to the Principle's office but she also admires female star ship captains, recognizes hard work (fry and the holophoner), and naturally distrusts cephalapod doctors. There are a lot more issues I hope she can start to pick up like the value of friendship, that math is awesome and to never be without your doomsday device "for duck huntin'!"
Mutant anthrax is for duck huntin'. Doomsday devices can be used for, amongst other things, triggering chronoton implosions and powering bending units.
I'm sure she doesn't "get" a lot of it at this stage, but I bet she will learn a surprising amount from sticking with it.