FACT: Your brain is more diluted with water than your blood. Due to being made almost completely of fat your brain is a nice juicy and moist hunk of thoughts, in fact it is about 80% water which is quite a lot. Whereas bloods water is all in the plasma, and the water concentration in blood is only around 50%.
The large amount of brain moisture means very odd things happen. In fact when there isn’t enough water your brain actually shrinks inside your skull and pulls on the membranes connecting it to the skull causing great pain. So try to avoid that.