probably talking about vicodin/hydrocodone..... in which you crush up the pills to a powder pour it in cold water to dilute the codine (what you want) and all of the acetomenophine sinks to the bottom then you can either boil it down to get the powder or just drink the water...the only reason you do it is if you are worried about your liver and your taking more than 3 or 4 at a time....it doesn't give any diffrent feeling .....just a safer way to take high doses...