In the Pandorica opens the doctor takes Amy to see the oldest planet in the universe with a cliff of pure diamond with letters 50' high that's never been translated. Now in the episode its a message from River telling him where to meet her but I was thinking what if it wasn't. What if the writing on the cliff was the same writing in the impossible planet. Writing that was so impossibly old that even the TARDIS can't translate it. The first message written in a language even the time lords can't translate but that could if playing with the doctor, or someone familiar with his adventures be recognized as the same writing in the prison for an ancient evil so powerful that it had to be dropped into a black hole to stop it. Here it is again that same writing on the oldest planet in the universe as was found in only one other place a prison in orbit round a black hole. What is the writting? Is it a link to the prison, a warning of another of that creatures nature contained inside the planet, the geological equivilent of "Spaz rulz loozerz"? More importantly now that you know it was written by the same beings who imprisoned the beast do you dare ignore it or do you follow it down a rabbit hole into a past now forgotten where all sorts of old ones may lurk?