They are two men and one women, all of them in their twenties. The woman has long black hair and is very beautiful, one of the men is thin, brown-haired and needs to use glasses, and the other guy is bald and taller than his companions.
"Well, ladies, it looks like the division was a complete success." the woman says. "I know you two must be feeling really awkward right now, but I can assure you this is absolutely normal. My coworker Bruce will explain all you need to know." she says, referring to the thin scientist.
"Right now, you must still be feeling some sense of individuality, like you're a single mind... controlling two minds. And, of course, you can either just control one at a time, or order two of your bodies to do the exact same thing. However, this will change in a few hours, in which you'll become able to control two bodies at the same time, and by tomorrow your mind will be definitively split into two and you'll start thinking as two separate minds instead of only one who controls them. And to accelerate the process, we're putting you into extended sleep, and when you wake up, nobody will be able to notice you two come from one woman... not even you." he explains. "Larry will give you a pill and a glass of water, please swallow them and sleep."
Just then, you notice the bald guy has been holding a small plate with two glasses of water and two pills. You proceed as said, and soon you're sleeping profoundly...