When I opened the kitchen door to take out the trash, I saw the trashcan lid on the ground. I approached the can and saw a large possum resting on top of the trash.
The possum looked at me and then lifted the rear of his upper lip. By this, he revealed several sharp teeth. I had no problem reading his lips and his message. It was very effective, non-verbal intimidation. I got back behind the kitchen door to figure my next move.