Homer: Hey, do we get to land on an aircraft carrier?
Pilot: No, Sir, the closest vessel in the USS Walter Mondale. It's a
laundry ship. They'll take you the rest of the way.
[shot shows frogs destroying all the crops]
Homer: Hey, look! Those frogs are eating all their crops.
[everyone starts laughing]
Lisa: Well, that's what happens when you introduce foreign species into
an ecosystem that can't handle them.
[everyone laughs more]
[a lone koala holds onto the helicopter with determination]
-- Imminent koala infestation of the US predicted,
"Bart vs. Australia"