Tear Jerker / Justice League: Doom

• Two stand out moments— Bruce being buried alive in the same coffin as his parents' corpses and having to punch his way out, and Green Lantern's method of being taken out is to make him think he killed two people by making a bad call. His soft weeping will have you in tears within seconds.
• The Justice League's Darkest Hour montage: Superman falling after being shot, Batman being buried alive, Green Lantern left broken and sobbing, Martian Manhunter burning in agony, Wonder Woman slowly exhausting herself fighting the "Cheetah's", and Flash gradually stumbling as he tries to keep the bomb on his wrist from detonating. The music played during the montage doesn't help.
• Hal apologizing to an unconscious Carol, saying he still feels guilty over what she's become.
  "I do keep hurting you, don't I?"
• Even if it was inevitable given the source material, it is still a sad moment at the end when the Justice League decides to vote on if Batman should remain or get kicked out due to his breach of trust with his contingency plans. The biggest difference here though is that when Batman is given the chance to plead his case he gives himself no defense and quits the League right away when the others don't understand why he did what he did.