Grinch transformation story

My brother and I are working on a weregrinch transformation story involving Jim Carrey. It's set around Christmas time. We are thinking of how we're going to write Jim's metamorphosis into a weregrinch. We are considering the following options:

• American Werewolf In London style
• Quick and painless
• Slow and gradual

Let us know which one you would like us to put in.