I'm going to wake you up in a moment, John says to Dan, his words penetrating Dan's deepest subconscious mind. "But when Mary snaps her fingers and says the word 'sleep', you're going to sink right back down into trance for her, ten times deeper than you are just now."
Dan's eyelids flutter open as he slowly awakens. He blinks, and tries to focus. What the hell was that? That was weird. 
He remembers that he's in his boss Mary's office. Did that guy just hypnotize him?! Dan looks at Mary, who's smiling, and is about to say something when she holds up her hand and snaps her fingers and says to him, "Sleep!"
Instantly, it's like Dan's mind shuts down as he plummets straight back down into an extremely deep hypnotic trance. 
Mary can't help laughing. "Holy shit!"
Mary and John then proceed to repeat this process of waking Dan up and having Mary snap him back under several more times.
"From now on, Dan," John tells him while he's deeply under, "any time Mary snaps her fingers and says the word 'sleep', you will drop back into hypnosis for her, even deeper than you are right now. Mary will be able to put you under whenever she wants."
Dan's mind is programmed. Mary can hypnotize him any time, simply by snapping her fingers and saying 'sleep'.
John then wakes Dan from trance, bringing him all the way up, and telling him that he will consciously remember nothing about being hypnotized. Dan believes that he was just called into Mary's office for a routine discussion about work.
Dan walks out of the room and back into the main office with no memory of what just happened.