The sarcasm world on Instagram: "The word “insane” is often used to describe something extremely wild, crazy, or out of the ordinary, whether it’s a person’s behavior, a situation, or even an experience; in everyday conversation, people might say “that party was insane” to mean it was unbelievably fun or chaotic, or “he’s insane” jokingly to describe someone doing something daring or ridiculous. Medically, however, the term historically referred to severe mental illness, though modern psychology