Yin-Yang was always against themselves most of the time. They would constantly fight and argue, most of which was started by yang. But during inanimate insanity invitational, they met candel, and she taught them how to treat each other as equals and work together... until candel betrayed the alliance they were in with some of the other contestants. Yin-Yang was very confused and hurt by her betrayal and couldn't sleep later that night

Yin: yang, I can't sleep