Coffee, the original king of caffeine.
Now if we were talking energy drinks, my answer would be "The one that doesn't taste like every other one." then I'd pause for effect while everyone tried to guess what it might be, and then I'd say "EXACTLY."
Now if we were talking energy drinks, my answer would be "The one that doesn't taste like every other one." then I'd pause for effect while everyone tried to guess what it might be, and then I'd say "EXACTLY."