Steven Universe - the look on their faces

The most heartwarming faces has to be Pearl and Greg's. When their dwindling hope was fleeing, they have been reinvigorated by his face. Connie and Amethyst's face screams "Holy crap, where did he come from?!" And Garnet has a face that screams "I can't believe this vision came true!"

The fact that they did tell Greg and he's helping to get Steven back is so great to see.

I'd have been pissed if they just ignored him.