When the agents plan on wounding someone to attract the black market doctor, Stavros offers the use of his "left" leg because he claims he can't really feel it anymore; however, when he stabs himself with a utility blade, he stabs his "right" leg.
Stavros volunteers to be injured in his left thigh, stating that he has no feeling in his left leg anyway. Moments later, while the other agents are arguing about it, he stabs himself in his other leg and he and the other let out blood-curdling screams.