Mary had always loved dolphins and decieded to try that first. She went out back to her pool, set the box of vials down, and removed her clothes. She took the dolphin vial and started to drink it. But then it occured to her the instructions said nothing about the duration of the change and as a dolphin she would have no way to get another vial!
Realizing this, she stopped drinking. She had only had about half the vial; the instructions said to drink the whole vial for the full effect so she should be fine, right?
She had just placed the vial back in its place in the box when she began to feel strange. She looked at her legs and noticed they had began to turn gray, like the skin of a dolphin.
Mary realized that while you needed to drink a whole vial for the full effect drinking part of a vial would apparently cause a partial effect. She waited to see what would happen...