LOL...you know, the adrenaline hormone, the one produced when you're excited, afraid, happy...etc. It's the one that increases your heart beat & intensifies your senses so when you get a rush of adrenaline you experience this extreme excitement...I don't seem to be describing it quite right..um mm...you know the feeling you get when you're speeding on the highway 180 km/hr? it's something like that & more