Definition
Spookasa is a series of spooky and shocking fanart featuring the anime Lucky Star's character Hiiragi Tsukasa.

Origin
It is unknown when exactly the first image of this Spookasa series was made, but it was first posted to 4chan in 2010. The First picture being of Tsukasa with a utility knife getting ready to slit her wrist.

The very next image that was uploaded to the site was even more disturbing with her eyes seemingly having been cut out and blood dripping from both her eye sockets and her mouth.

Spread
Many other piece of work were then done by pixiv User Lieca

What soon followed was more pictures of Tsukasa in Disturbing and Spooky situations and art styles that were both unique and parodied other famous art works from Edvard Munch
and Vincent van Gogh
and Pierre Auguste Renoir.
Many other pieces of art were made in the Surrealism style in the likeness of Artwork by Salvador Dal