Particular “power poses” raise testosterone and lower cortisol levels (in both men and women) and increase feelings of power and tolerance for risk. (Carney et al. 2010)
Negative moods can decrease gullibility, increase persuasiveness and social influence, and improve the accuracy of eyewitness recollections. (Forgas 2007, Forgas 2008, Forgas et al. 2005)
From post on Dark side hacks: