all you people saying Nas, you'd think that if you drank the stuff on a regular basis you'd know how to spell it, it's NOS, okay? like Nitrous Oxide System...not the rapper. and to the guy who said chugging it made his eyes twitch or whatever, i call bullshit, i chug at least three Nos' a week and that never happens to me. My guess is that it's all psychological, most energy drinks don't actually give you any energy at all, just a caffiene/sugar high, which simply makes you think you are energized.