trained with a dialect coach to create McCoy's accent and reprised the role in its sequels Star Trek Into Darkness and Star Trek Beyond. Cultural impact McCoy is someone to whom Kirk unburdens himself, but is a foil to Spock. He is Kirk's "friend, personal bartender, confidant, counselor, and priest". Spock and McCoy's bickering became so popular that Roddenberry wrote in a 1968 memo "we simply didn't realize ... how much the fans loved the bickering between our Arrowsmith and our Alien". Urban said McCoy has a "sense of irascibility with real passion for life and doing the right thing", and that "Spock's logic and McCoy's moral standing gave Kirk the benefit of having three brains instead of just one." Kelley said that his greatest thrill at Star Trek conventions was the number of people who told him they entered the medical profession because of the McCoy character. He received two or three letters a month from others reporting similar experiences. A friend observed that despite not becoming a doctor as he had hoped, Kelley's portrayal of McCoy had helped create many doctors. According to Kelley, "You can win awards and that sort of thing, but to influence the youth of the country ... is an award that is not handed out by the industry". "He's dead, Jim." Twenty times on the original Star Trek series, McCoy declares someone or something deceased with the line, "He's dead", "He's dead, Jim", or something similar. The phrase so became a catchphrase of the character that Kelley joked that the line would appear on his tombstone—and it appeared in the first sentence of at least one obituary—but disliked repeating the line. During filming of Star Trek II: The Wrath of Khan, when Spock is dying from radiation exposure, Kelley felt it would spoil the gravitas of the moment, so he and James Doohan agreed to swap their lines: McCoy warns Kirk not to open the chamber, and Scotty says, "He's dead already". University of Southern California literature professor Henry Jenkins cites Dr. McCoy's "He's dead, Jim" line as an example of fans actively participating in the creation of an underground culture in which they derive pleasure by repeating memorable lines as part of constructing new mythologies and alternative social communities. "I'm a doctor, not a..." Another of McCoy's catchphrases is his "I'm a doctor, (Jim) not a(n)..." statements, delivered by Kelley 11 times,