Not to be confused with caterwauling. :smack: Kitty linky here.
I got three tiny kittens and shut them upstairs while I was at work to protect them from the overly affectionate big dog. When I came home, couldn’t find the kittens. Then I heard strangle mewling downstairs. The kittens had gotten a little too curious about a small hole around the upstairs bathroom sink and they’d fallen down inside the wall between the downstairs bathroom and bedroom. The neighbor and I took a sledge hammer to the wall to get them out.
I refer to my cats as “the Hole in the Wall Gang”.
Ah yes. An adult kitty belonging to one of my customers decided to go exploring while the access panel was off to replace her shower fixture. I closed up the wall not knowing the kitty was inside. We removed a cobweb covered moggie a few hours later. 
When I was about ten years old, my family moved out of the place we were living then and bought our own house. My cat, Fluffy, freaked out by all the commotion, wedged herself in the wall panel where all the pipes were for the bathroom. My parents thought she got outside (I was at my grandparents house) until my aunt finally found her.
When I was in high school, we moved into a new house, and unbeknownst to us there was a small gap at the bottom of the backing of the stairs in an under-the-stairs closet just big enough for our cat to squeeze through, but then she couldn’t figure out how to squeeze back out. We thought she was lost, and spent many hours wandering the neighborhood in the pouring rain, calling for her and crying and feeling absolutely hideous, while the poor cat was stuck under the stairs with movers clumping up and down on them all day. By the time we found her, many hours later, she’d called for help so much she’d lost her voice. 
I have never in my life felt as bad, I don’t think, as the trauma that poor cat went through that day. (Not that it harmed her in the long run; she lived to be nearly 23!)
I’m somewhat disappointed with the lack of creativity in the cat’s name. I mean, the cat was dubbedHal, just because the poor animal was rescued a few days before Halloween? I’m sorry, but that’s just lame.
Why not Spackles, or Plaster of Purris, or even Wally?
I think “Wally” would be an especially appropriate name for a cat that had been stuck in a wall and was owned by Dopers.
I love that quote. Maybe because it’s getting pretty late here and I’m way overtired, but that just struck me as adorably funny.
I’d have to go for Walter as the name.
It’s roots are traced to 2001, A Cat Oddity
Hal: Lemme outta this damned wall!
Kitty 9000: Sorry Hal, I can’t do that.