[They're both lucky the Doctor rarely empties his pockets. He'd just about forgotten it's there anyway!]

Ohh, yes! [He grins broadly at his friend and pumps his fist into the air.] It's got to be! There's no such thing as coincidence, Jamie.

[And now, he's energetically bouncing around his cell, once again trying his sonic screwdriver on the lock in hopes it will work on it now. It doesn't, but it's worth a try!] It does make you wonder, though...why so many keys? What needs so many?