Insanity, craziness or callan is a spectrum of behaviors characterized by certain abnormal mental or behavioral patterns. Insanity may manifest as violations of societal norms, including becoming a danger to themselves and others, though not all such acts are considered insanity.
Girl: "I can't up with you this weekend"
Girl: "I'm being sent to a psychiatric ward."
Boy: "What? you seem fine to me."
Girl:"Nah...I've gone Callan."
Boy: "Oh, that's a shame. Get better soon!"