Coffee/Water are poisonous...

If you think venom's of Cobra, Wild Spider or Scorpion are more poisonous; think again.

Yesterday, I was watching some programme on National Geo. The program was about Poisons. I learnt that

1) 40 cups of coffee in an hours will be more dangerous.
2) 100 glasses of water in an hours will be still more dangerous.

Not sure whether one can have 40 cups or 100 glasses in an hour. What surprises me is that if any have it, it will turn poisonous.