When the Night King Takes Down Viserion
This one hurt on multiple levels. Yes, the dragons are bloodthirsty creatures who would eat anyone up if they were given the means to, but that doesn't make them bad! They didn't ask to be born and used to burn hundreds of people in their mother's quest for the throne. And they definitely didn't ask to be taken beyond the Wall to fight the Night King. Poor Viserion was just following his brothers and being a good dragon for his mom when he meets his end at the hands of the Night King. He didn't deserve to go out like that! And now he's the Night King's undead ice slave. It isn't right!