Turns out the Moonlings' phone and fax numbers are not one and the same. The fax number is actually the Grubs'! The Grubs receive the invitation, and trace it back to Earth. Knowing that Earth is the home of the Sydney Opera House, and it would make a delicious meal, the Grubs instantly send a 3D video-fax back to Samantha saying they accept. Confused, Samantha calls the Grubs' back and tells them they aren't actually invited. The Grubs' are annoyed and disappointed; and decide they will go to the party and eat whatever they find on Earth.