No. You'll keep on peeing it out.

Yes! http://www.hhp.ufl.edu/faculty/pbird/keepingfit/ARTICLE/toomuchwater.htm

Definitely. People have died from it. A stupid radio station ran a "Wee for a Wii" contest in which the contestants had to drink as much water as they could without weeing; the runner up died. Then there was the case of Leah Betts, who knew you should drink a lot if you take Extacy, and took so much she died. See http://en.wikipedia.org/wiki/Water_intoxication

yes, a guy who ran the london marathon died from drinking too much water. he drank so much that his body became deficient in salt.

yup, I you go on a water diet to loose weight and don't remember to add salt, you can actually die. I'm being serious here, I saw it on the news awhile ago.

LOL my chemistry teacher was telling us last yr how when he was young him and his friends used to get high off water by drinking so much because it thins out your blood and then he was like no seriously kids it could kill you!! ok so yeah don't drink TOO much

yeah, but it sounds hard to believe...

There was a girl who died in a radio disc jockey stunt fairly recently. She was trying to win an Xbox for her kids. The winner had to drink the most water in the shortest period time. So, yes, there IS such a thing as water poisoning. Her belly got so fat she looked like she was pregnant. And, she had a massive headache. Then she died. The DJ's basically said, "Yes we are aware it's dangerous but they signed a release so if someone dies we aren't responsible". This is only one reason why I can't stand radio disc jockeys.

Yes it is, and it could cause acute water intoxication. Consequence is acute swelling of the brain cells that causes coma and often death.

Apparently yes. http://www.answerbag.com/a_view/2027395

Yes. It can result in hyponatremia, an electrolyte imbalance.

i've heard you can drown yourself, but i dont know if its true, nor would i want to find out.

Yes. http://en.wikipedia.org/wiki/Water_intoxication I honestly thought my drill instructors were trying to kill us when they made us drink as much water as they did.

Yes, commonly known as water-intoxication, as linked by urk. It's quite a common effect of the usage of ecstasy, and one of the main causes of death from it. The body constantly tells you that you're thirsty, no matter how much water you drink.

It's not how much you drink but how fast you drink too much that causes the problem. If you drink a lot, but slowly enough for urination to keep up you shouldn't have a problem. If you drink too much too fast it can result in water intoxication: "When too much water enters the body's cells, the tissues swell with the excess fluid. Your cells maintain a specific concentration gradient, so excess water outside the cells (the serum) draws sodium from within the cells out into the serum in an attempt to re-establish the necessary concentration. As more water accumulates, the serum sodium concentration drops -- a condition known as hyponatremia. The other way cells try to regain the electrolyte balance is for water outside the cells to rush into the cells via osmosis. The movement of water across a semipermeable membrane from higher to lower concentration is called osmosis. Although electrolytes are more concentrated inside the cells than outside, the water outside the cells is 'more concentrated' or 'less dilute' since it contains fewer electrolytes. Both electrolytes and water move across the cell membrane in an effort to balance concentration. Theoretically, cells could swell to the point of bursting. "From the cell's point of view, water intoxication produces the same effects as would result from drowning in fresh water. Electrolyte imbalance and tissue swelling can cause an irregular heartbeat, allow fluid to enter the lungs, and may cause fluttering eyelids. Swelling puts pressure on the brain and nerves, which can cause behaviors resembling alcohol intoxication. Swelling of brain tissues can cause seizures, coma and ultimately death unless water intake is restricted and a hypertonic saline (salt) solution is administered. If treatment is given before tissue swelling causes too much cellular damage, then a complete recovery can be expected within a few days." http://chemistry.about.com/cs/5/f/blwaterintox.htm