Energy: Of the five hour variety

I like energy drinks. At a time in my life when sleep is in short supply, energy drinks have filled much of the void. I realize that I might perish due to guarana or l-tuarine poisoning when I'm 65, but I'll roll the dice for now.

"180", "5 Hour Energy", and the Starbucks fallback "Quad Grande Dry Cappuccino" are personal favorites. What about you? Got a secret energy concoction to share? I'm always looking for a good fix...