I think the stuff was/is called Everclear. Not sure if the stuff is even made any more.
You get served a glass of water and another with 2-4oz of Everclear. You are supposed to drink the Everclear , straight , without stopping. And not up-chuck.
If successful , you get a card saying you've been Hyderized.
Out of 8-9 of us there, only myself and Dad's buddy were successful !
When you set your empty glass down, the server lights the glass on fire .... the left over fumes burn a clear blue flame