This was prompted by a tutorial deemed appropriate for Halloween http://www.deviantart.com/team/journal/Tutorial-Draw-a-Magic-Potion-with-Anastasia-berry-974789325
The first thing I thought of when I read the tutorial was that bottle from Alice in Wonderland, the one marked "Drink Me". I've only seen a few scenes from the movie, particularly the one where Alice eats a cookie or some treat labeled "Eat Me" and gets big, then drinks the potion and shrinks.
Hope you like this.