I sat in front of some talkers. Some example dialogue:
Dummy 1: "Who is that?"
Dummy 2: "Captain America."
*Ant Man's first scene*
Dummy 1: "Who is that?"
Dummy 2: "Huh I'm not sure!"
Then Dummy 1 read "The Vanished" out loud (it wasn't the first time she'd read text on screen out loud) and I had to say something. And to her credit, she stopped.