Back when I was in college I would leave my assignments until the last minute. So I'd usually start them at 6pm the evening before they should be handed in. I'd drink Relentless (hadn't long been out) to keep me going, and I'd rock up to college before midday the next day with 3 assignments all completed. I'd then go to a gaming place (like a glorified LAN party building) and stay there until about 11pm. When it got to 1pm I would be flagging and started to pop 2 Pro-Plus along with the relentless - like an absolute moron. I felt my heart do 3 beats for every beat if that makes sense. "bump bump bump, bump bump bump".
I did this though for a few days on the trot, until every time I drank relentless I would get sharp pains in my stomach. I knew at the time though that these drinks are full of chemicals and really aren't good for you, so I don't drink them now. So I don't know how anyone can think drinking Red Bull, even one, is good for them or are surprised their body starts to fail because of all that sugary chemically goodness.