It's hilarious that Palmer sets door alarms! They're really ingenious in their own way sometimes!
I've mentioned the neighbor's cat, who has free range of the neighborhood. He comes by to visit occasionally (or even meets our car sometimes when we pull into the driveway!), and I give him some kitty treats on the back deck, which is adjacent to the kitchen window. If he feels he hasn't had enough, and he sees a light on in the kitchen, the li'l bugger jumps up on the deck railing, sticks his claws in the window screen, and rattles it. First time we heard that, we couldn't figure out where the sound was coming from. I opened the curtain to look outside, and came face to face with the little dickens meowing for more! To avoid this, we sometimes wind up putting our groceries away with the light off!