Evil laughter
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An evil laugh is a stock manic laugh by a villain in fiction. In comic books, where supervillains utter such laughs, it is variously rendered as mwahaha, muhuhaha, muwhahaha, or bwahaha. (Compare Ho ho ho.) These words are also commonly used on internet Blogs, BBSes, and games. There, they are generally used when some form of victory is attained, or to indicate superiority over someone else. The words are often used as either interjections or less frequently, as nouns.
I HATE YOU ALL