King of Thorn/WMG

(Movie adaption) Everything is a comatose dream
Laura, the girl who threw herself from a building at the start of the movie, actually survived the fall but fell (no pun intended) into a coma; the entire plot is something dreamed up by her subconscious as her brother visits her, bringing red roses and reading the Sleeping Beauty to her. It all makes sense now!

"Medusa" is a wad of Tyranid; heavily corrupted by Chaos.
A combination of Body Horror and The Heartless; it fell through the cracks of the Warp "long ago in the future" (time has no meaning in the Warp) and fell to modern-day Earth as a comet. Dreams and Nightmares become infectious reality, although bound by biological limits.