Sam recounting the car wreck which killed her parents, and her reaction on popping back a few feet away
Damien kidnapping Mark, specifically Dr. Bright's and Sam's reactions.
Caleb's reaction to Damien taking away Adam. He beats the shit out of him, which doubles as a Moment of Awesome, but his breakdown afterwards is heartbreaking.
Also doubles as a Heartwarming Moment with how Frank and Adam speak from their own experience to help calm him down and reassure him.
Frank's first full therapy session with Dr Bright.
Frank: I don't deserve it. This life. I should have- I should have gone with them
Chloe, after ~40 episodes of staying positive and cheery for the rest of the group, finally breaks down in the season 3 finale after a firm blow to the head and admits that she isn't completely fine with her ability and sometimes wishes she could get rid of it altogether, feeling like she can never truly be comfortable with anyone.
Chloe: I can't stop listening and opening my mouth and blurting things out and I know I shouldn't, I'm trying to keep it all in, but my brain is just one brain and it gets crowded and something has to leave or my head will explode and there's- there's just a little part of me that thinks maybe having everyone else's thoughts knocked out of me wouldn't be so bad.
The reveal in Episode 41 that Caleb's anger is beginning to take him over again after the events of episode 40. His insisting to Sam that he isn't dangerous just makes it more painful.
