 After Eli Wallach (qv) agreed with Sergio Leone (I) (qv) that  Tuco would carry his pistol on a lanyard, the director asked him to  grasp the gun by shaking his neck, thus making the gun land in his  hand. Wallach claimed that he wasnt able to do the intended action,  and asked Leone to demonstrate it. When Leone tried, the pistol  missed the directors hand and hit his crotch. Leone then told  Wallach to hold the gun in the belt.