Theres a site that allows you to see how much caffiene you would have to ingest to die all you have to do is enter your weight and the caffiene product of your choice heres an example (this is my real data to btw)
Coke - 409.50 cans 5 Hour energy - 102.38 botttles Monster Energy - 88.30 cans Mountain Dew - 261.62 cans
At 5'10", and 230 lbs I could take about 100 cans of monster till I die... :O You would think that by the 100th can a majority of the caffeine would be gone