T-Rex: It's time for one of our occasional upside down comics.
Utahraptor: What's our excuse this time?
T-Rex: We're Australian!
T-Rex: I know!
T-Rex: Did you know? In Australia, not only are things upside down, but gravity is in the opposite direction?
T-Rex: From a certain point of view.
T-Rex: Namely the middle of the North Atlantic Ocean.
The author writes:
 From a certain point of view.
 Told you.
 Antipodes - Wikipedia. Astonishingly given the size of Australian mainland plus Tasmania, none of it is exactly on the opposite side of the world to any land whatsoever. It comes close to the Azores and to Bermuda, but misses both of them. Check out this cool map tool for finding antipodeal points!