Heartwarming / Interstellar

• Doyle making sure Brand and CASE have boarded the shuttle safely before he follows them and shuts the outside airlock hatch. Unfortunately, it's a bittersweet kind gesture, as it ultimately costs him his life, and leads Cooper to angrily call out Brand on her foolishness.
• Brand and Romilly show signs of being old pals. She's caring when she notices he has temporary space sickness and gets visibly distressed when she and Cooper return from Miller's planet 23 years later, with Romilly aged and uneasy from his long wait.
• The conversation between Brand and Cooper about The Power of Love:
  Brand: [L]ove isn't something we invented - it's observable, powerful. Why shouldn't it mean something?
  Cooper: It means social utility - child rearing, social bonding -
  Brand: We love people who've died...where's the social utility in that? Maybe it means more - something we can't understand yet. Maybe it's some evidence, some artifact of higher dimensions that we can't consciously perceive. I'm drawn across the universe to someone I haven't seen for a decade, who I know is probably dead. Love is the one thing we're capable of perceiving that transcends dimensions of time and space. Maybe we should trust that, even if we can't yet understand it.
• Cooper taking a crying Dr. Mann, who's just been woken from cryosleep, into his arms. And later, Cooper quietly putting his hand on Brand's shoulder to comfort her when she's upset and despairing after learning of her father's death.
• Cooper's entirely silent and somewhat chillingly stoic resolve to rescue the Endurance before it de-orbits, which would destroy any remaining chance of the mission succeeding. It's not heartwarming just because of how dutifully and matter-of-factly Cooper takes to it, but because it reflects what Dr. Mann, of all people, told him just minutes ago. Cooper turns what was originally said in a pessimistic and unpleasant tone into a cause for hope.
  Dr. Mann: You're feeling it, aren't you? The survival instinct. That's what drove me. It's what drives all of us, and it's what's going to save us.
• As much as Tom and Murph don't get along in later years, she shows genuine concern for him and his family. Them eventually burying the hatchet, with Murph embracing her surprised brother, is all the more heartwarming.
• When Cooper finally meets an aged Murph on her deathbed:
  Murph: I knew you'd come back.
  Cooper: [emotionally] How?
  Murph: Because my dad promised me.
  • The fact that, while profoundly tear-jerking, one of the last things Murph sees before she dies is her father whom she hadn't seen in decades.
• Cooper and TARS's "robromance" throughout the film. They start out as Vitriolic Best Buds, but quickly become Fire-Forged Friends, and are True Companions by the end. When Cooper discovers TARS inert on Cooper Station because the latter's power supply died in space, he promptly requests a new one and uses it to fix TARS back up, good as new, that very evening so he can keep the one companion he still has. They also conspire to steal a Ranger so they can leave the station together to seek out Brand and CASE.
• Though she's not the first human on Edmunds' world, it's rather fitting that the awkward and withdrawn Brand becomes the founder of the first colony on the planet, and seems to be approaching it with a Stiff Upper Lip, despite her predicament and everything she's been through.

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