Nibbler: I don't understand.
Future Fry: Yes you do! You came back in time to knock me into that freezer. Now I came back in time to stop you.
Nibbler: I did not come back in time. My people lack that ability.
Future Fry: But, I know you in the future. I cleaned your poop.
Nibbler: Quite possible. We live long and are celebrated poopers.