1. E has very addictive side effects, and it can make a depressed person very happy, so they tend to take it any time during the day so they can stay elivated. Usually this results in de-hydration, sleep deprivation and seizures, because they lose the ability to tell when their body is exhausted.

2. If you drink too much water, you can actually drown your body. This type of death has actually happened a lot with long distance marathon runners, over-hyrating and causing thier body to drown. It sounds crazy but it happens.
http://www.erowid.org/chemicals/mdma/mdma_health_water.shtml
http://www.jnj.com/news/jnj_news/20031030_105713.htm;jsessionid=AVNK51NQEEY0CCQPCB3WU3QKB2IIWTT1

I've never been into the "E" scene. But I have a 2 hour long speech that I give to any of my friends who consider taking it, about it's harsh side effects and the terrible things it does to your body.