Yeah I remember them always saying "too much of anything can kill ya...even water". But when was the last time you were actually afraid to overdrink water.That is a freak thing in my opinion.
Not really. I've heard of a couple of cases as well. In Brussels an african women died recently because they made her drink like a bucket during an exorcism.
http://en.wikipedia.org/wiki/Water_intoxicationBody fluids contain electrolytes (particularly sodium compounds, such as sodium chloride) in concentrations that must be held within very narrow limits. Water enters the body orally or intravenously and leaves the body primarily in the urine and in sweat. If water enters the body more quickly than it can be removed, body fluids are diluted and a potentially dangerous shift in electrolyte balance occurs.
Most water intoxication is caused by hyponatremia, an overdilution of sodium in the blood plasma, which in turn causes an osmotic shift of water from extracellular fluid (outside of cells) to intracellular fluid (within cells). The cells swell as a result of changes in osmotic pressure and may cease to function. When this occurs in the cells of the central nervous system and brain, water intoxication is the result. Additionally, many other cells in the body may undergo cytolysis, wherein cell membranes that are unable to stand abnormal osmotic pressures rupture, killing the cells. Initial symptoms typically include light-headedness, sometimes accompanied by nausea, vomiting, headache and/or malaise. Plasma sodium levels below 100 mmol/L (2.3g/L) frequently result in cerebral edema, seizures, coma, and death within a few hours of drinking the excess water. As with alcohol poisoning, the progression from mild to severe symptoms may occur rapidly as the water continues to enter the body from the stomach or intravenously.
A person with two healthy kidneys can excrete about 1.5 litres (0.39 gallons) of water per hour at maximum filtration (other studies find the limit to be as little as 0.9L/h (0.24 gal)[2]). Consuming as little as 1.8 litres of water (0.48 gal) in a single sitting may prove fatal for a person adhering to a low-sodium diet, or 3 litres (0.79 gallons) for a person on a normal diet.
source:
http://en.wikipedia.org/wiki/Water_intoxication