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

Relevant xkcd

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