"Must be.  I don't have anything like that in my TARDIS."  The Doctor moved around the console in search of said lever, putting on his glasses as he looked.  When he found it, he peered at it quizzically.  "That's odd."
Donna rolled her eyes, ignoring the Doctors and moving over to Clara.  "Hello, I'm Donna, I travel with the skinny streak of nothing over there.  Who're you?"