Ghost Peppers

In 2007, North India's Bhut Jolokia - or ghost pepper - became the first pepper to break the 1 million mark on the Scoville scale for spicy heat, earning the title of World's Hottest Pepper in the Guinness Book of World Records and launching it into salsa superstardom.
The Scoville scale is the measurement of the pungency of chili peppers or other spicy foods as reported in Scoville heat units, a function of capsaicin concentration.