This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Static Shock
"Flashback," a Time Travel episode in which Virgil goes back to meet his deceased mother, Jean, on the night she died in a gang riot as a paramedic caught in the crossfire whilst trying to save lives. Virgil reveals his secret identity as Static to her and begs her to stay out of harm's way so she doesn't die this time, painfully explaining his reasons, though he doesn't explicitly mention she is destined to die, instead mentioning that she will be hurt. However, Jean's desire to help people drives her back onto the streets even though it's implied she has figured out why Virgil gave her such a dire warning. His panic as he sees Jean with her ambulance crew among the fracas as he is stuck in the time bubble that returns him to the future is heartbreaking, made even worse when he runs home with the faint hope that he succeeded, only to discover that Jean still died.
Adding to that is the reveal of what did change: on the night she died, Jean told everyone how her son was a hero and that she was proud of him.
In "Consequences," Virgil's showboating gets his friend, Daisy, into a temporary coma during a fight with Puff and Onyx. He feels like it was partially his fault, which is sad to see a hero have this sort of problem potentially harming someone close to them.
"Jimmy" involves the titular character, a depressed kid who gets bullied a lot. It gets worse when he brings a gun to the Community Center and aims it at his bully, Nick. Richie and Frieda try to talk him out of it, and the boy is crying. And as he's trying to put the gun down, Nick's goons tackle him, causing him to (accidentally) shoot Richie in the leg. This shocks Jimmy into curling up and sobbing.
When the bullies shove Jimmy into a locker, the poor kid is screaming and begging for them to let him out. He looks and sounds terrified, implying that he might be claustrophobic. When Virgil opens it, Jimmy falls out with tears streaming down his face.
There are two other really hard-to-watch scenes tied to the above.
Virgil ranting about how upset he is about the events: 1.) He's mad at the bullies for starting the whole thing, 2.) He's mad at Jimmy for shooting Richie in the first place (even if it was just an accident), and 3.) He's mad at himself for not doing more to stop it.
The exchange when Virgil is signing Richie's cast. While it is somewhat Played for Laughs, Richie remarking about if the bullet had hit just a little higher and Virgil very firmly telling him not to go there is hard to hear.
When Static and Hotstreak are chained together, they learn they're in a medical facility. Hotstreak totally flips out, eventually revealing that when he was a kid, he ended up having to spend two years in a hospital. This reveals a somewhat poignant side to his usual thuggish portrayal.
Virgil finding out about Mr. Foley's racism. It's blatantly clear that Virgil is deeply hurt (and not entirely on his own behalf; he's shown later to just be thrown by how someone like Richie can have a dad like that) and that Richie is devastated when his best friend leaves. Then the exchange where Richie snaps at his father about how his father got what he wanted and that his best friend's gone before snarling "I hate you!" and disappearing into the streets to ultimately getting captured and held hostage by Ebon.
What he said though:
Richie: My friend is gone because of your stupid racism! I HATE YOU!
In the Season 1 finale "Tantrum," Virgil's family is planning a memorial service for his deceased mother, Jean. As much as Virgil misses her, at this point in the series, he still hasn't fully come to terms wit her death, so he doesn't want to take part in it because it would hurt too much. Later on in the episode, he and Richie are watching an old home video of when Virgil was a baby, which Richie's intentions of making fun of him. But when Jean appears on the tape calming him down, Richie finally understands why Virgil did not want to see it.
Richie: Now I see why you didn't want to look at this. She was so great, and now she's...gone.