Solveig spots a trick where there isn't one
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Solveig begins the task normally, filling the cup to a decent height with milk. However, after she has done this, she explores the table and discovers the flower vase. Because the show has made her very paranoid, she comes to the conclusion that the vase may be what actually contains the milk, and she therefore removes the flowers from the vase, pours all of her milk back into the container, and then refills her cup with the water from the vase. Because her glass is mostly filled with water, she ends up in fourth place.
(Written by Will G and proofread by Karl Craven)