GZ is the most painful sauce in my collection (until I recently got The Final Answer).  There is a difference between heat and pain.  I consider the mad dog silver collector sauce to be extreme heat.  This, is pain.  It feels like someone is driving a nail through your tongue. Pepperheads know this sauce by name, and for me, it's the only sauce that releases those endorphins and gets me all giddy like a school-girl.