I HAVE ACTUALLY SEEN A GUY ATTEMPTING TO CREATE A DOCKER IMAGE *INSIDE* ANOTHER DOCKER CONTAINER!

I have considered asking why, but then concluded that not knowing makes it a lot funnier.

Containerizing containers will be the next step in scalability. That guy's a pioneer!

So is he actively installing docker in that container or is he using a builder container? (The last one is normal and therefore less funny)

Dockerception.
The container have to start on a deeper level!

Or...
The classic!

Yo dawg!
I heard you like containers.
So I started a container in a container, so you can start another container in this container, while being logged in a container in a container!
Maaaaaan. Awesome, dude!

Actually, I'm using Gitlabs docker in docker to create and maintain custom docker images under ci

Container all the things!

Relevant xkcd

An usual sight in many CI setups. Got to build those containers in isolation.