As others have said, cut the kid some slack. Yes, he did something stupid but I'm sure many of us, if not comatose, have hospitalised ourselves for stupid things. (Personal child examples include playing on building sites and not looking both ways on a one way street).
Also, regarding OMG dangerous energy drinks! From wikipedia: 2008: Jacqueline Henson, a 40-year-old British woman, died after drinking four liters of water in under two hours as part of her LighterLife diet plan.* A lot of things can be harmful if they are mis-used. (No, I am not saying water and energy drinks are exactly the same.)
* Look up water intoxication for some other interesting examples.