Short story from Australia

Last week, when I was sleeping in the bedroom, a dark grey Koala came in through my open window. To my surprise the Koala immediately jumped on the table and bounced right over the lamp, knocking over the glass of coke that I had poured earlier.
The Koala then ran into the garage where it over turned the cat that was sitting on the ladder.

After 12 minutes of chasing the Koala through the house I finally caught it and put it outside. The Koala quickly climbed the nearest streetlight out of my reach. I didn't know what to do next.