I know that I drink a lot of coffee. I probably have a bit of a tolerance to caffeine at the moment, so the possibility of death by caffeine overdose never really occurred to me. But Energy Fiend's Death by Caffeine Calculator has actually put my mind at ease, because I know that I could not possibly consume the 58 cups of drip coffee required to kill me in the few hours it would take the caffeine to pass through my system. Nor could I finish 185 diet Cokes. I might consider trying the 595 mugs of cocoa if I had a plentiful enough supply of marshmallows, though.
A more recent Death by Penguin Mint Calculator lets you choose your poison from a variety of caffeinated candies. 8,327 Hershey's kisses? Given the fact that a pile of kisses that size would weigh a little more than 80 pounds (36 kg), I think I would have issues other than the caffeine to worry about.
How much caffeine would it take to take you out?