"... a conjoined twin. Its always been a fantasy of mine, actually." You say.
"Ah, I have just the thing." Said the woman. She went to one of the shelves and pulled a spray bottle off the shelf. She walked back to you and held out the bottle.
"This liquid will actually grow you a conjoined twin, right out of your body. She will have a personality of her own and will look exactly like you do. Are you ready?" She said.
"Um... Yes, I am." You say, nervously. She sprays the liquid all over your body and you suddenly feel the urge to pull in one direction. You do so but half your body stays put while the other pulls. Your face starts to divide and soon enough, you and your new sister's heads are sitting on the same pair of shoulders.
"Hey." Your sister said.
"Hi. Whats your name?" You ask her.
"Um... what's yours?"
"Sarah."
"Then, I'm Farah. What do you want ot do now?"