Hopping mad: Beefcake Kangaroo takes on impossible rival (VIDEO)
Filmed from the safety of an Oz home, the footage shows a large marsupial appearing increasingly irate at finding another kangaroo on its patch.
However, what the kangaroo thinks is an encroaching rival is actually its own reflection in a window.
The confused animal can be seen to drag its razor sharp claw down the pane of glass as a man inside the house witnesses the freaky face-off.
Clearly intent on finishing off an imagined opponent, and ignoring a warning from the homeowner, the kangaroo then aims a vicious low blow at the window.
Luckily, the glass did not cave in or the homeowner might be complaining about broken bones rather than a scratched window.