Sentence:  “Believe it, man. In fact, she's seriously creepy. Like creepier than that pink-haired girl from Future Diary.” /  “Wait, what?” Sam got that reference quickly, but was not happy with the comparison. She wasn't a psychopathic, murderous <WSD>Yandere</WSD> stalker, from what he could see. 
Meaning of the word marked with <WSD> tags:  A character, usually a girl, who fits the archetype of being genuinely kind, loving, or gentle, but suddenly switching to being aggressive or deranged, often homicidally so.