"What's Forges's device?" the Doctor wondered while he turned this way and that as if Kurt could make anything of the screwdriver. Only if he knew how to read the lights and sounds the device made, which generally sounded about the same to most others. To the Doctor it was an electronic language he knew very well.
"You're right. Cats told me about hairballs and they're about as much fun as they look - which is not at all fun. Does the screwdriver sound different to you when I talk?"