It's quite simple!

Using the Mezmerizing fruit hat(Mesmerizing Fruit Hat - Item - World of Warcraft) + entering feral form (claws of Shirvallah) will make your character go wild which is also visible by others. I wish I had a recording program but sadly you'll just have to see the results in form of this GIF.

Leaving your feral form will then bug your normal dancing form.

Enjoy.

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