Cheese grater

A cheese grater was an Earth appliance used to grate cheese. The Eleventh Doctor considered it an uncool appliance, and asserted that his TARDIS was nothing like it. (TV: Journey to the Centre of the TARDIS)

When Ernest Derricks was a boy, his mother administered punishment by way of a cheese-grater. (PROSE: Heart of TARDIS)

On the Crooked World, Jasper tried to kill Squeak with a cheese grater, but failed. (PROSE: The Crooked World)

When Victoria Waterfield woke up in a Kathmandu hospital, her throat felt like a cheese-grater. (PROSE: Downtime)

Daniel Matthews, having been shot and wounded by an Auton, felt like he'd had a shave with a cheese grater. (HOMEVID: Auton'')

Credit Card felt that talking to Ming while jacked into the system direct was like rubbing his brain on a cheese grater. The Seventh Doctor described himself as "the cheese grater in the goldfish bowl" to Kadiatu Lethbridge-Stewart. (PROSE: Transit)

When Fitz Kreiner woke up after Compassion knocked him out, his throat felt as if he’d swallowed a cheese grater. (PROSE: The Fall of Yquatine) Fitz later described his headache as "cheese-grater pain." (PROSE: The Book of the Still)