The Signature Lines of Dialogue (Star Trek)

Several characters in the Original Star Trek series have signature lines of dialogue. Spock regularly says "Fascinating." Dr. McCoy says "He's dead, Jim." Uhura says "Hailing frequencies open." And Chekov says "Aaaaaaggggggghhhhhh!" Actually, the Enterprise's navigator screams in only five episodes of the Original Star Trek series: Mirror, Mirror (to be precise, it is the mirror universe Chekov who screams), The Deadly Years, Day of the Dove, The Tholian Web, and The Way to Eden.