After the second Marie came back with the towel, the first said, "I was gonna change you but I don't need to."
"Why change me?" asked the second.
"Because we don't want Mary to know we used the vials!"
"Yeah. She'd get mad we did it without asking. So what do we do? If we don't change and we don't want her to see two of us..."
"Then one of us has to hide!"
Both of the Maries started to run off, then they stopped and looked at each other. Finally the first said, "You do it. We can hide in the closet and you're closer to it."
The second Marie ran to a closet, opened it, and tried to stay in a corner, as the first came up and closed the closet door. Just as she returned to her meal, the door opened and Mary came in....