狂 kuáng insane

insane; mad; wild

How it came to be

A dog with the king block beside it for the sound. Everybody had seen a dog go mad, and the word for madness in people comes from that.

Describes wild, unrestrained intensity - of behavior, weather, or emotion - rather than clinical madness: 疯狂 fēngkuáng (crazy/frantic) is the everyday word for over-the-top or reckless behavior.
狂欢 kuánghuān (to revel/party wildly) and 狂热 kuángrè (fanatical, zealous) describe intense collective excitement or obsession.
Very productive as a suffix meaning "-holic/fanatic": 购物狂 gòuwùkuáng (shopaholic), 工作狂 gōngzuòkuáng (workaholic) - a pattern learners can reuse freely.