Basically, moments in vidya that bring this warm, fuzzy feeling to your heart. More specifically, I'm looking for moments where people you helped previously express their gratitude by supporting you when you need them the most.
Be it that one moment in Okami when the boss nearly mauls you to death but Furball gets nursed back to health through the power of concentrated prayers.
Or that other scene in the (however unpopular - just talking about another example here) Mass Effect 3 where being a good guy saw a gigantic liberation fleet of all the various alien races warping in near Earth.
Or just about another other scenario where you technically should be dead meat, only to find that your friends show up, and do not only turn the table, but smash it (and the villain with it) through several walls.
Or, alternatively, just moments where a thankful NPC slings it's arms around you and mutters a heartfelt "Thank you" that goes beyond the usual "Quest completed, here is -XY- gold and -Random Enchanted Item-.