In America, there are extreme food called Tiram Rocky Mountain is made from testis of cow.
Tiram Rocky Mountain
Now we move to Africa. They eat cow's blood. They took the blood without kill the cow, just took blood from the nerve.
In Europe, they have Black Pudding that is made from blood and lard. They also have Casu Marzu. This is goat's milk with full of insect's larva. For the extreme drink, they have Absinth with alcohol more than 74%.
In Asia, they have Doh Khileh. This is salad with steamed pig's brain for the garnish (india). In China, they have a machine that sells living crab. This is so weird but quite interesting, so people don't have to queue in the market to buy crabs.
Indonesia have some food that people think it's extreme. Bothok Tawon, Lawar Bali, Rujak Cingur, etc.
From the business point of view, I think extreme food can be quite interesting for the business. Some people don't like it, but it doesn't mean everyone don't like it. There are some people will spend their money to feel the extreme one. I think I may sell drinks that is contained with alcohol more than 60%. Because in Indonesia, there are nothing like this before. And I think it works.
Source:
https://www.google.com/search?tbm=isch&q=tiram+rocky+mountain&spell=1&sa=X&ei=Lr8hU6-fIY79kAX55YDoBQ&ved=0CDMQvwUoAA&dpr=3&biw=360&bih=592#biv=i%7C3%3Bd%7CNJtFuEmr4C7ZpM%3A