An elevator car door system, comprising: an elevator car (103, 203, 403, 603, 703) having an elevator car door; and a movable elevator car door coupling (300, 400, 500, 600, 700) attached to the elevator car (103, 203, 403, 603, 703) and arranged to control operation of the elevator car door, the movable elevator car door coupling (300, 400, 500, 600, 700) comprising: a mounting bracket (302, 402, 502, 602, 702) attached to the elevator car (103, 203, 403, 603, 703); a first blade (304, 404, 504, 606, 704) attached to the mounting bracket (302, 402, 502, 602, 702); and a second blade (306, 406, 506, 606, 706) attached to the mounting bracket (302, 402, 502, 602, 702), wherein the first (304, 404, 504, 604, 704) and second (306, 406, 506, 606, 706) blades are operable to engage with a landing door coupling to operate the elevator car door, and wherein a portion of the movable elevator car door coupling (300, 400, 500, 600, 700) is arranged to contact a ceiling (435, 735) of an elevator shaft (117, 417, 717) during an overrun event, wherein, when the portion contacts the ceiling (435, 735), at least a part of the movable elevator car door coupling (300, 400, 500, 600, 700) moves relative to the elevator car (103, 203, 403, 603, 703), and when the portion is not in contact with the ceiling (435, 735), a biasing element (318, 320, 418, 420, 518, 520, 640) urges the portion toward a normal position, characterized in that the movable elevator car door coupling (300, 400, 500, 600, 700) further comprises a deterrent (314, 414, 514, 614, 714) attached to the mounting bracket (302, 402, 502, 602, 702); a deterrent support (316, 416, 516) fixedly connected to the mounting bracket (302, 402, 502, 602, 702), and the deterrent (314, 414, 514, 614, 714) being moveably connected to the deterrent support (316, 416, 516) and further characterized in that the portion comprises the deterrent. an elevator car (103, 203, 403, 603, 703) having an elevator car door; and a movable elevator car door coupling (300, 400, 500, 600, 700) attached to the elevator car (103, 203, 403, 603, 703) and arranged to control operation of the elevator car door, the movable elevator car door coupling (300, 400, 500, 600, 700) comprising: a mounting bracket (302, 402, 502, 602, 702) attached to the elevator car (103, 203, 403, 603, 703); a first blade (304, 404, 504, 606, 704) attached to the mounting bracket (302, 402, 502, 602, 702); and a second blade (306, 406, 506, 606, 706) attached to the mounting bracket (302, 402, 502, 602, 702), wherein the first (304, 404, 504, 604, 704) and second (306, 406, 506, 606, 706) blades are operable to engage with a landing door coupling to operate the elevator car door, and wherein a portion of the movable elevator car door coupling (300, 400, 500, 600, 700) is arranged to contact a ceiling (435, 735) of an elevator shaft (117, 417, 717) during an overrun event, wherein, when the portion contacts the ceiling (435, 735), at least a part of the movable elevator car door coupling (300, 400, 500, 600, 700) moves relative to the elevator car (103, 203, 403, 603, 703), and when the portion is not in contact with the ceiling (435, 735), a biasing element (318, 320, 418, 420, 518, 520, 640) urges the portion toward a normal position, characterized in that the movable elevator car door coupling (300, 400, 500, 600, 700) further comprises a deterrent (314, 414, 514, 614, 714) attached to the mounting bracket (302, 402, 502, 602, 702); a deterrent support (316, 416, 516) fixedly connected to the mounting bracket (302, 402, 502, 602, 702), and the deterrent (314, 414, 514, 614, 714) being moveably connected to the deterrent support (316, 416, 516) and further characterized in that the portion comprises the deterrent. a mounting bracket (302, 402, 502, 602, 702) attached to the elevator car (103, 203, 403, 603, 703); a first blade (304, 404, 504, 606, 704) attached to the mounting bracket (302, 402, 502, 602, 702); and a second blade (306, 406, 506, 606, 706) attached to the mounting bracket (302, 402, 502, 602, 702), wherein the first (304, 404, 504, 604, 704) and second (306, 406, 506, 606, 706) blades are operable to engage with a landing door coupling to operate the elevator car door, and wherein a portion of the movable elevator car door coupling (300, 400, 500, 600, 700) is arranged to contact a ceiling (435, 735) of an elevator shaft (117, 417, 717) during an overrun event, wherein, when the portion contacts the ceiling (435, 735), at least a part of the movable elevator car door coupling (300, 400, 500, 600, 700) moves relative to the elevator car (103, 203, 403, 603, 703), and when the portion is not in contact with the ceiling (435, 735), a biasing element (318, 320, 418, 420, 518, 520, 640) urges the portion toward a normal position,