It did, though. Or ...something like that. Something about the town possessed me and convinced me that Bill Cipher was haunting me. No matter what I did, I couldn't catch him, I couldn't stop him from taking control of me, causing me to black out, and then leaving me with all these awful injuries.

[He stops here for a moment. His expression twists into an upset grimace and for a moment, there's a horrible sound from the trunk. It's not sinister and violent sounding. It sounds anguished, instead.]

In Grunkle Ford's journal, he writes about these signs of possession. The last one, the worst one, and the final sign that Bill's straining his host too much is ...burning and bleeding in the right eye.