You Can Die From Coffee
Yes, it exists! There is such a thing as a lethal dose of caffeine. Medical literature even contains reports of people dying from ingesting large amounts of caffeine, most often through unconventional means, such as injecting caffeine straight into the bloodstream or even having a coffee enema (literally putting coffee in your butt! Disgusting!).
Based on researches, it takes ten grams of caffeine in one sitting to kill a person, which would be between 80 and 100 cups of coffee, which is pretty hard to do.