John: We will have a big exam tomorrow in Physics, and I’m afraid I’ll fail.
Laura: Have you been studying?
John: You know me. I study all the time. And I know the material until I step into the exam room.
Laura: What happens then?
John: It’s like I’m two people. Once I pick up the exam paper, all my knowledge is gone.
Laura: That’s hard to believe.
John: But it’s true. My head is filled with a buzzing noise, the words blur on the page, and I can’t think. And…
Laura: And what?
John: And I break into a cold sweat.
Laura: Oh, I feel for you.