since this is a computer related forum and there is a bit of a nerd stereotype re: energy drinks and Mountain Dew etc.. this might be worth highlighting - chugging them down quickly can be rather dangerous:
http://www.bbc.co.uk/news/world-us-canada-39932366
http://www.bbc.co.uk/news/world-us-canada-39932366
The 16-year-old died from a "caffeine-induced cardiac event causing a probable arrhythmia".
He had no pre-existing heart condition.
The teenager weighed 90kg (200 lbs) but would not have been considered morbidly obese, Mr Watts said.
"This is not a caffeine overdose," Mr Watts told Reuters news agency.
"We're not saying that it was the total amount of caffeine in the system, it was just the way that it was ingested over that short period of time, and the chugging of the energy drink at the end was what the issue was with the cardiac arrhythmia."