You'd be right but usually not baseballs. The last time aliens challenged Earth to a baseball game for the fate of the planet we were stupid enough to hand it over to the Mets, and well...

Now we just punch the aliens. Way easier to win.

[She absolutely won't get the joke but he's not giving up an opportunity to mock the Mets. Ever.]

Usually we need invisible jets, invisible spaceships, sometimes invisible uniforms for invisible people so the clothes go invisible the same time they do.