Joy (The Impossible Astronaut)

Joy was an American who worked in the White House. Upon emerging from a toilet cubicle, she sighted one of the Silence. She considered its face to be a Star Trek mask. When she looked away, she forgot what she had seen. However, she then looked again and repeated her actions, despite the warnings of Amy Pond. The Silence then killed Joy with an electrical discharge from its hand, utterly disintegrating her. A horrified Amy demanded to know why the Silence had killed Joy, but got told that her name was Joy. (DW: The Impossible Astronaut)