Well, one of my readers warned me about the persistance of possums.... and he was right!
We've been closing the door at dusk generally, but the other night we forgot. When Annie went out to the back room to shut it, look what she found... our little furry visitor perched on the edge of the big container of cat food! We're not always good at screwing the lid down tight, and she figured that out. Once she realized she was spotted, she hunkered down under a shelf unit, and it took a lot of time and some judicious use of the broom again to get her out.
We're a lot better about closing the door in the evening now!
Stubborn little critter, huh?