I have no idea why I found this interesting.

The Scoville scale is a measure of the “hotness” of a chili pepper. These fruits of the Capsicum genus contain capsaicin, a chemical compound which stimulates thermoreceptor nerve endings in the skin, especially the mucus membranes, and the number of Scoville heat units (SHU) indicates the amount of capsaicin present.

October 2012 Live Chat: Everything You Want To Ask About Taking A Career Break With Expert Sherry Ott