Weregrinch

On the night before Christmas, Jim starts to act more strangely than usually. He starts to become more than a little "grinchy" around this time of year. To make matters worse, it's a full moon night.

Jim and Jenny are having a Christmas eve dinner together when suddenly Jim starts to feel very strange and rushes off to the bathroom.

" I'm fine, i'm fine, i'm fine." Jim tries telling himself while looking in the mirror.
Then his mirror reflection jeers...."I don't think so. I just stole your girlfriend's christmas presents and cut down the tree with a chainsaw. Does that sound fine?" and chuckled evilly.
Jim looks to see that his hand is in "the claw" position from Liar Liar.

"What have you done with my haaaaaaaaaaaand?" Jim cries out.

Meanwhile Jenny is wondering why Jim's taking so long.

Jim looks in the mirror again just to see if Mirror Jim isn't there anymore, he sees his regular reflection in there but slowly it changes becoming more grinch-like, and pretty soon Jim starts experiencing the exact same thing.

First his eyes turn a yellowish colour, then a wicked Jack Nicholson-like cheshire cat smile appears on his face, he starts growling a little as well as developing quite a few grinchy characteristics as well as enhanced senses and super strength.

"Oh no. Not now. No!" he cries.

Then the changes continue as thick, lushious green fur starts slowly sprouting ALL OVER his body starting with his hands, his fingernails grow into long, black, sharp claws and his toenails do the same too.

"W-W-W-What's happening to me?" He cries.

Jim becomes even more grinch-like as the changes continue, this time the green fur sprouts on his face, he also develops very bushy eyebrows and his facial features become more grinch-like as a grinch-like muzzle starts to grow on his face- his nose turning black and moving upward. He starts becoming more and more grinch-like. He tries crying out for help but nothing happens.

And finallly Jim's changes finish off as his grinch-like muzzle finishes growing, his canine teeth become vamprish fangs, his hair grows longer and turns a dark green colour, his ears grow pointed and when the transformation is complete he is now the weregrinch.
Jim, now a weregrinch looks a like the grinch from the movie except he doesn't have the termite infested smile, his hair is longer and a dark greenish colour, he has much thicker fur, and he has his normal voice not the sean connery accent the one from the film has. He also still keeps his humanity while in grinch form and doesn't develop a taste for garbage or glass bottles but he does growl a little, but only when he's angry.
Jim in his new grinch-like form uses his super strength to break down the bathroom wall, goes outside and roars a loud, ferocious grinch-like roar at the moon.

"Raaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaawr!"