Would you eat the worm?

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Imagine finding yourself in the following situation. You arrive at a psychology laboratory to participate in an experiment. The experimenter tells you that the purpose of the experiment is to understand the effects of "certain tasks" on physiological responses. On one side of a table, you see a series of covered cups, and on the other side you see a dead worm on a plate, a cup of water, a napkin, and a fork. The experimenter reminds you of your rights as a participant, saying that your participation is voluntary and you are free to terminate the study at any time.

Next, after doing a neutral task where you assess the weights of the covered cups, the experimenter tells you that you have been randomly assigned to an experimental condition where you will be asked to eat the worm. You then wait for ten minutes while the experimenter goes to do something in another room, during which time you are left to anticipate your upcoming worm-eating experience. When the experimenter returns, he or she says, "Oh, an error has been made. You weren't exactly assigned to the right condition. You actually are supposed to choose which task you will perform, between eating the worm or discriminating the weights."

What do you decide? Do you eat the worm even though you no longer have to? 
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