Weasel war dance
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The weasel war dance is a colloquial term for a behavior of excited ferrets. The war dance usually follows play or the successful capture of a toy or a stolen object. It consists of a frenzied series of sideways hops, often accompanied by an arched back, dooking or hissing noises, or a frizzy tail. Although the weasel war dance may make a ferret appear frightened or angry, they are often just excited and are usually harmless to humans.
The term was popularized by (among others) Scott Adams in the Dilbert comic strip.