I accidentally wrote a story that was similar:

A man lives alone in his apartment. He needs to return to the office for the first time in months. He arrives at the office, and quickly develops excruciating back pain. A few days pass, and he finds himself unable to work. He also starts finding strange bite marks on his neck and back.

He calls out for a few days, but eventually, he has to go back. He arrives at work and sits in his chair. He quickly feels his back pain return, but also strange movements from his chair. He stands and screams, tossing the chair. The office staff are in shock. He then uses a pen knife to cut open the back of his chair. As he does, there are multiple screams, as a large, spine-like centipede emerges from the chair.

I even did the rough draft for the comic, but never finished. Damn I need to.

That chair was made for me!

But see, that’s much creepier than some impossible, unknowable horror… it’s something disturbing that conceivably could happen.

Danny Dev Ito

How the fuck do you eat from a can like that?

Didn't Impractical Jokers do this as a punishment once?

He was trying to hide and eating canned fish?

The human chair was adapted from a story by author Edogawa Ranpo though.

Okay but poop bag?

Iain M Banks has entered the chat

So was that really a broken spring?

"The call is coming from inside the chair!"

“I’m living in your walls!” so? I’m living in your chair

fnaf