At first, I was convinced the noise had to be coming from the alley. Nothing in our yard could possibly make that much noise.
Just to be sure, I turned on the porch light, and what do I see but an enormous, 15-pound King of Opossums with its freaky misshapen white head stuck all the way under the grill cover.I flash the porch lights at it. No reaction. I try a camera flash (hey, weird animal photos!). No reaction. I don't really want to go out and get bitten, but what the heck, I'm bigger and it's my damn grill. The moment I open the door, it bolts down the stairs and off into the dark. I go back to sleep, triumphant.
The opossum bided its time and returned an hour later. It made less noise the second time around, but it was clearly still attacking the grill. I opened the back door, chased it off again, and took the dripping pan away. End of visit.
The dog wisely slept through the whole thing.