I was at a Mexican restaurant recently where they had about 50 different hot sauces you could put on your food. They were lined up from mildly hot to volcano level.
The hottest one had a hardcore warning label and I was thinking to myself I wonder how hot it really could be? So I put just a tiny tiny tiny drop on my pinky finger to see and licked it. Holy shit, it felt like sulphuric acid was burning a hole through my tongue. I can't imagine how anyone could put it on their food and not go into shock.
So be careful if you try it!
