One of the major myths pertaining to MDMA, also known as ecstasy, involves “ice cream sized scoops” being destroyed in the brain. This is not true. The myth started circulating after an erroneous study that was published. You can read more about it here. You can also hear the retraction on an NCR news cast that I found on youtube here.

Other myths include dangers of drinking too much water.
Also False. Drinking too much water is only dangerous due to depletion of electrolytes. Drink a Gatorade, Disani or Powerade every few bottles and you’ll be fine.
Water myth debunked here

And finally does ecstasy drain your spinal fluid?
No. You can read more about that one here.