Back to The Future/Tear Jerker

The Films
"Marty:"
 * Have a couple of tissues ready in Part II when
 * No! This can't be happening!
 * The scene when Marty receives the letter from Doc can cause some to get misty eyed, the music doesn't help either. It's not sad, it more or less causes tears of joy.
 * Big one in Part III when  Seeing one of   like that is heartbreaking. The worst part is seeing

"Marty:"
 * A deleted scene in Part III shows Marshall Strickland gunned down by Mad Dog Tannen, right in front of his son. He dies on the spot. It was actually for this reason the scene was taken out, though the event has been confirmed as canon, thanks to the game.
 * Any scene with Doc and Clara within thirty feet of each other that is not a Crowning Moment of Heartwarming is bound to be a Crowning Moment of Heartbreaking. Case in point: Right before Clara  and cue Doc's big brown puppy-dog eyes
 * In the second movie, there's a scene when Jennifer finds out that Marty had a car crash thirty years ago, from racing Needles when he called him a chicken. This crash broke Marty's hand, which left him unable to play guitar very well, and forever crushing his Rock Star dream. Then we see Future!Marty silently playing his guitar.
 * Both times that

The Telltales Game

 * In Episode 3 it's hard to watch Citizen Brown struggle with what he's done. The road to Hell is paved with good intentions, indeed.
 * After Marty breaks up Emmett and Edna, Emmett hides up on the clock tower ledge, and sings a couple lines from Trixie's "I Don't Care" to himself.
 * The ending of Episode 4.
 * Episode 5:
 * Episode 5: