Emil Gallardo

Former U.S. Marine Drill Instructor Ermey was originally hired as a technical adviser and asked [Director Stanley] Kubrick if he could audition for the role of Hartman. However Kubrick, having seen his portrayal as Drill Instructor SSgt Loyce in The Boys in Company C, told him that he was not vicious enough to play the character. In response, Ermey made a videotape of himself improvising insulting dialogue towards a group of Royal Marines while people off-camera pelted him with oranges and tennis balls. Ermey, in spite of the distractions, rattled off an unbroken string of insults for 15 minutes, and he did not flinch, duck, or repeat himself while the projectiles rained on him. Source.