Tim Murphy sent us this juicy bit from the Chronicle of Higher Education:
 The Chronicle of Higher Education reports the results of a study in the
        current issue of European Journal of Social Psychology. 
        Researchers identified 72 female students who said they favored voluntary
        euthanasia.  Researchers then gave orange juice to these subjects, but half 
        of them got juice spiked with caffeine.  The students then read a series of
        arguments against voluntary euthanasia.  An after study showed that the 
        subjects receiving the caffeinated juice remembered more of the arguments 
        AND were more likely to shift towards anti-voluntary euthanasia views.  Similar 
        results obtained in a study of 76 males.  
 ["Coffee for Persuasion, "The Chronicle of Higher Education, July 7, 2006, A17; thanks Timothy Murphy UIC]