They talked it over, and after a few minutes came to a conclusion.
"You can drink it," said the right Joanna. "It's the same stomach anyway."
"You just don't want to taste it," said her left twin.
"I didn't say that," said the right one.
"Don't lie. We're the same, remember? I have a pretty good idea what you're thinking. But, okay, I'll drink it."
She took control of the arms and legs and took the potion while her right twin watched. "Well... down the hatch," she said nervously.
She swallowed it.
It burned on its way down, and it felt to the both of them like their entire body was on fire. They doubled over, bracing against the counter, and the right Joanna looked up at the old woman in anguish before being overcome by the fire.
In time, the pain subsided, and the twins could begin to assess what had happened to them.