Gorilla with no bones

In "Ramona the Brave", Ramona and her sister Beezuz (Beatrice) are in their beds trying to imagine what was making the scary sound they heard from the hallway.

They were pretty sure it was a gorilla with no bones that could slide under the door.

A truly disturbing entity. It was flat and hairless, but its blood red eyes poked out of the top of its collapsed head, its throbbing brain only adding to its terrifying lumpiness...

But I soon realized that, lacking a support structure, it could not move, only twitch and moan.

It was a fell beast, and I crushed the life out of it with my stocking feet, ignoring its vague and feeble entreaties to stay my will...

The dark stain never came out of my carpet...