Possums (Trichosurus vulpecula) are nasty little buggers.
Point in case, about 2 seconds after the above picture was taken, the nasty little bugger bit me in my finger. With extreme prejudice, I might add.
Also, when I was staying in Canberra last year, the bastards liked to sit right outside my window and... well, you have to hear it to believe it, so without further ado, the mating call of the nasty little bugger, or Common Brushtail Possum:
Link to file 'cause I can't upload files to Blogspot
They like to do this at about three in the morning, and can (and will!) keep it up until you decide to get up.