Being happy and having a group sex orgy and then snapping and transforming into a different person, a dark person, and killing everyone in the building. Your once-friends are now your enemies, and they don't even know it. All you see is red blood tint, from your shattered eye. "It speaks to me" you will say, because the universe has opened a corridor through your mind, and they won't understand, so you will have to make them understand.