I had a bean soup in Kentucky a few weeks ago that had been made with Ghost Pepper. When I say made, it wasn't chopped through it as such, apparently they just put a whole one in the saucepan while it was simmering and then removed it before serving.
I've had curries that were hotter (though not much) because they were full of chopped chillies, but I've never tasted anything with the sheer blazing intensity of chilli heat that exploded out of what appeared to be an innocuous white soup. And that was just from floating a single chilli in what must have been a huge cauldron.
A friend of mine has grown these this year, very successfully. They are superb when used in cooking (gloves on to chop them) but we have only tried eating the tiniest spec of the pepper raw and it is soooo hot. We made 2 separate curries, one in each, and both were amongst the hottest curries I've eaten, but they were very good. Also they work a treat for making hot spicy salsa, but be cautious, don't use more than one in a batch. There is an oriental food shop in Brighton, can't remember the name, not Taj, that sells a type of Naga, not sure if it is the Jolika, might be the Morich, or just a plain old Bengal Naga. Also, the little Asian shop near to the car audio place on Heene Road in Worthing often has them for sale in a basket on the checkout counter.