From "Doctor Who: The Time Warrior: Part Four (#11.4)"
You are truly a great magician, Doctor.
To tell you the truth, Hal, I'm not a magician at all.
Sarah Jane Smith
I'm not so sure about that.
[the Doctor enters the TARDIS, followed by Sarah, and the door closes. Hal is momentarily startled as the TARDIS's engines start up and the blue box magically disappears before his eyes