Special K is a drug that can be snorted or injected. It causes you to lose control of your body and makes you and your mind feel like they're in some other world. The process usually take 30 minutes to an hour. When it happens you'll have absolutely no idea what is going and absolutely no control.
In the movie "KIDS" (please watch see this movie) one of the female characters snortes Special K at a rave. The drug takes affect soon there after but she is able to get to a freinds house for another party. Eventually the drug takes full affect and in the final see gets raped by one of the guys in the party. She didn't even realize that see was being raped since she was still high on Special K.