Doctor

You approach his tent out of curiosity and so as not to seem suspicious in the circus, and you find the doctor.

Hello, come sit here.
Remember to roll up your sleeves

You do it and sit in the place where the doctor asked you to sit, and he ties your hands on the seat.

You: Why are you doing this?!

You ask him, and the doctor answers you.

I'm doing this so you can't escape. If you run, you might hurt yourself. There are a lot of sharp things here...

You calm down and listen to him.

The doctor is one of the characters in The Freak Circus franchise, that very famous psychological horror novel game.