An elevator car door system, comprising: an elevator car having an elevator car door; and a movable elevator car door coupling attached to the elevator car and arranged to control operation of the elevator car door , the movable elevator car door coupling comprising: a mounting bracket attached to the elevator car ; a first blade attached to the mounting bracket ; and a second blade attached to the mounting bracket , wherein the first and second 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 is arranged to contact a ceiling of an elevator shaft during an overrun event, wherein, when the portion contacts the ceiling , at least a part of the movable elevator car door coupling moves relative to the elevator car , and when the portion is not in contact with the ceiling , a biasing element urges the portion toward a normal position, characterized in that the movable elevator car door coupling further comprises a deterrent attached to the mounting bracket ; a deterrent support fixedly connected to the mounting bracket , and the deterrent being moveably connected to the deterrent support and further characterized in that the portion comprises the deterrent. an elevator car having an elevator car door; and a movable elevator car door coupling attached to the elevator car and arranged to control operation of the elevator car door , the movable elevator car door coupling comprising: a mounting bracket attached to the elevator car ; a first blade attached to the mounting bracket ; and a second blade attached to the mounting bracket , wherein the first and second 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 is arranged to contact a ceiling of an elevator shaft during an overrun event, wherein, when the portion contacts the ceiling , at least a part of the movable elevator car door coupling moves relative to the elevator car , and when the portion is not in contact with the ceiling , a biasing element urges the portion toward a normal position, characterized in that the movable elevator car door coupling further comprises a deterrent attached to the mounting bracket ; a deterrent support fixedly connected to the mounting bracket , and the deterrent being moveably connected to the deterrent support and further characterized in that the portion comprises the deterrent. a mounting bracket attached to the elevator car ; a first blade attached to the mounting bracket ; and a second blade attached to the mounting bracket , wherein the first and second 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 is arranged to contact a ceiling of an elevator shaft during an overrun event, wherein, when the portion contacts the ceiling , at least a part of the movable elevator car door coupling moves relative to the elevator car , and when the portion is not in contact with the ceiling , a biasing element urges the portion toward a normal position, <EOS>