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.
https://gyazo.com/907b1fb464b37c37e26908e999066c7a
Quick edit: Leaving your feral form will then bug your normal dancing form.
Enjoy.
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.
https://gyazo.com/907b1fb464b37c37e26908e999066c7a
Quick edit: Leaving your feral form will then bug your normal dancing form.
Enjoy.