The fabled Demon Core was a radioactive plutonium sphere housed in a beryllium hemisphere. By holding the hemisphere in place with one hand and levering it with a screwdriver in the other ...

The Demon Core has become a meme in recent times, perhaps as a new generation believes themselves smart enough not to tinker with 6.2 kilograms of plutonium and a screwdriver.

According to Know Your Meme, one of the earliest works combining demon cores with cute girl illustrations was posted on April 4, 2018. A similar illustration was posted on April 18.