The Daft Dimension (DWM 482 comic story)
From Tardis Wiki, the free Doctor Who reference
The sixth instalment of The Daft Dimension was printed in DWM 482.
Summary
Clara Oswald asks the Doctor about the significance of the blackboard in his TARDIS. He explains that it is the ultimate solution for dealing with his enemies. He runs his fingernails down the board, with the loud screeching noise tormenting his foes.