Dirty Harry "Rawhide", was responsible for creating Callahan's distinctive old-fashioned brown and yellow checked jacket to emphasize his strong values in pursuing crime. Filming for "Dirty Harry" began in April 1971 and involved some risky stunts, with much footage shot at night and filming the city of San Francisco aerially, a technique for which the film series is renowned. Eastwood performed the stunt in which he jumps onto the roof of the hijacked school bus from a bridge, without a stunt double. His face is clearly visible throughout the shot. Eastwood also directed the suicide-jumper scene. The line, "My, that's a big
Dirty Harry (character) a jumper, Callahan states he is known as Dirty Harry because he is assigned to "every dirty job that comes along". When Harry is ordered to deliver ransom money to Scorpio, Gonzalez opines "no wonder they call him Dirty Harry; [he] always gets the shit end of the stick". In "Dirty Harry", Gonzalez humorously suggests that Callahan's nickname may have an alternate origin given that he twice ends up peeking through a naked woman's window and later follows a suspect into a strip club. The films reveal little about Callahan's personal background. In the first film, Callahan tells Chico Gonzalez's