Because sometimes, we just feel like giving a game a little more love.
The Rundown
Every now and then, as the player, we'll commit an unnatural act of kindness within a game. Not because the action will get us the infinity+1 sword, but for some reason that doesn't necessarily give us an upper-hand (and in some cases, these actions will hinder us, though we commit them anyway). Whether they are plot-driven or otherwise, we sometimes prefer helping characters rather than destroying everyone that stands in our way while we walk the virtual path to greatness.
General Guidelines
A heartwarming moment does not necessarily mean it makes you d'aww or have a heart attack from how sweet it is. Moments like these can be tragic, but viewed as incredibly kind or heroic when you look back on it. Note that not every tear-jerker moment is a heartwarmer. A man shooting your dog is a LOT less satisfying than a mercy kill.
There are plenty of these moments caused by other characters, but let's keep it down to what we as the players do, shall we? What you did, however, may or may not have any effect on a character in-game.
A heartwarming moment may be completely accidental! Sometimes we're just that good at being...good.
Please include which game it was you had these moments in, and give a little background if you think most people won't understand the scenario.
Notable Examples
Most D'aww-Worthy
My first moments playing old blockland 0002 mods, back when I found out about BL in '07
On a lazy summer afternoon, a random player showed up in a server I created. We chatted a little, and worked together on building a base that extended from underwater to sky level. By the time we were going to leave, we agreed to meet up in-game again. I joined up with the group of players he was in, and the things we did together resulted in some of the most fun I've ever had in any multiplayer game. Even after we moved on from 0002, we continued to chat and join each other's games. Even though we've pretty much stopped talking to each other by now, I still consider him to be a good friend and I'll definitely never forget about him.
Most Tear-Jerking
I was flying a new plane design that I had seen, and I had to crash land it. The Kerbals inside were stranded 14km from the Space Center, unable to get back in no reasonable amount of time, so I drive a rover all the way over there (takes longer than you think) and pick them up. Unfortunately one disappeared (RIP Edmund Kerman) and I drove them back, then ended the flight.
Most Awesome
The AI in ArmA 2 is amazing. I spawned with another ally as a sniper, both of us with that bigass anti-materiel sniper planning on shooting down a helicopter coming our way. We fired at the helicopter but it managed to land safely and the enemies inside got out. We fired shots at them and ran away as our magazines emptied. I take out another guy and see a guy run off into the forest. I pursue after him and am stumbling through the forest not knowing where he went. Suddenly I think "hey, where's my teammate?". I looked around for him but to no avail, I couldn't find him so I assumed he was dead. I also figured the enemy I was chasing ran off and got away. Then, I exited the forest and went prone at the bottom of a hill and reloaded my gun. But then just as I began to reload the enemy I was chasing stood up from the top of the hill and raised his weapon. Time slowed down to nearly a halt. "Damn, he's got me..." I thought. I closed my eyes. I heard the shot. "Am I dead?" I opened my eyes and saw the enemy dead on the ground and then my teammate emerged atop the hill. Best moment ever.
Let's keep this topic alive; if you have more heartwarmers or you would like to vote for categories or which moments should be in OP, post it here!