At Elmore junior high Carrie was attempting to replicate the potion to turn beings into ghosts for a much lower price to do strange terrifying things with Darwin. Naturally Darwin was observing and Gumball was with him. Gumball licked his finger and held it in the air for a few seconds before nodding and saying that "the test is green".
"What is that supposed to mean?" Carrie asked while arranging several beakers and eldritch artifacts.
"This is a fanfic so we'll have time to go into the specifics of how we're doing this, They can be really similar to the show sometimes. Actually the show going off air probably won't do anything at this point." Gumball explained to an utterly confused Carrie.
"What he means to say is this is literature and can be longer and the show's also effectively immortal." Darwin added to a still confused Carrie.
Carrie nodded and would probably ask Darwin more about it later when the potion was done. Gumball, Darwin and Carrie all circled around the beaker and began chanting:
"sample chant"
"Carl I swear I'll have this finished before Monday"
"Go to lovecraftian object organization if it's really that big of a problem"
"mandatory fourth line maybe add a fifth"
However before it could be finished Darwin sneezed making it less like a chant and more akin to horribly corrupted files. The compound glowed briefly before exploding into highly toxic fumes and strange energies. Several minutes later Darwin woke up in the school infirmary with Carrie next to him and Gumball seemingly unconscious in the next bed over.
"Is he gonna be OK miss?" Darwin asked the school nurse who was tending to Leslie's "unspeakably deformed petal".
The nurse sighed. "Yeah he's gonna be fine. Just in some limbo state for a while."
Meanwhile in a strange state Gumball hovered over the infirmary and was experimenting with his situation. Carrie didn't seem to see him this time and short of teleportation he didn't seem to have any ghost powers. After a few minutes he decided that he should probably get back into his body. But on the way down he "collided" with Carrie and realized that apparently possession was also something he kept. He (as Carrie) briefly looked around confused then got a evil smile. Maybe he shouldn't go back into his body just yet...