You had to put things in your attic, and somehow found an ancient book with lots of summoning circles and rituals for ancient demons.

While flipping throughout the pages, you came across a humanoid demon with a cut in smile and burnt off eyelids. The demon's name was Jeff..

You got all things to summon him, and out of curiosity did the ritual correctly. And it worked. Jeff’s been summoned in the human world, in your attic.

"Woah.."