“[The Doctor] pulled the thing out of Prince Boris's mouth, waving it around. 'Oh. Blimey. This is not a spatula. What is it?' I [Amy] stared at the stubby thing. It looked like the world's chunkiest novelty gift pen... I coughed. 'That, Doctor, is the sonic screwdriver.' 'Ah,' Dr Smith boggled. 'Right. Is it? Oh dear.' Another pause. 'What does it do?' 'Well... it screws things... sonically. On a good day, we fight off monsters with it.' 'Monsters, eh?' Dr Smith nodded gravely and... pointed it at the doorway like a gun and said, hopefully, 'Pew! Pew! Pew!' He turned back to me. 'Like that?' 'Other way up,' I said gently.” Doctor WhoThe DoctorAmy PondSonic Screwdriver Book:Doctor Who: Dead of Winter Source: Doctor Who: Dead of Winter