I tried the 800k Scoville unit "Satan's Blood". It's the one in the little swingtop bottle/vial, right? It's extremely hot, but like surmised by others, it tastes terrible. I never found a reasonable use for the stuff after the novelty of it wore off. I put a drop into a jar of salsa, and it was not only too hot for me at the time, but you could taste that metallic horribleness also. In fact, it's probably still in my cabinet somewhere, it's been untouched for several years. Maybe aging will tone down the flavor profile, which was mostly ground dust of aluminum, with that lead/acid tang of a battery. Maybe it'll mellow down to just sucking on a galvanized washer...