Pandora's box
Pandora's box was the subject of Amy Pond's favourite story as a child, The Legend of Pandora's Box. She said the box contained "all the worst things in the world". (TV: The Pandorica Opens)
According to the Romans, Pandora in fact opened a jar rather than a box. (PROSE: Combat Magicks) Ryan Sinclair used the legend as an analogy when claiming the characters his phone's video game, World of Combat, could be used to attack the Roman forces. (PROSE: Combat Magicks)
Martha Jones compared the transformation of Richard Lazarus via the hypersonic soundwave manipulator to Pandora's box, to which the Tenth Doctor concurred. (TV: The Lazarus Experiment)
Laura Mulholland mentioned Pandora's box in her suicide note. (PROSE: The Final Sanction)
In the Unbound Universe, the Brigadier compared the soul jar to Pandora's box. (AUDIO: Sympathy for the Devil)