Pandorica
From Tardis Wiki, the free Doctor Who reference
The Pandorica was mentioned by Prisoner Zero to the Doctor and told him that it would open and that silence would fall. (DW: The Eleventh Hour). River Song also mentioned the Pandorica to the Doctor, telling him she would next see him there and that she remembered it well. The Doctor believed the Pandorica to be a fairytale. (DW: Flesh and Stone)
