"You need an apropiate name, I mean, you're human and nobody is called the Doctor," Rose said.
"I know it, but listen to me, Earth girl, I'm the Doctor, just the Doctor. I cannot change that"
"But you have to...," She replied.
"I really love you and therefore I'm calling myself John Smith, I like this name, it sounds quite usual"
"Mr. Smith suits you, I like it" Rose agreed .
"It is very Doctor, isn't?"
She nodded.
"Oh, don't worry about him my sweety. He's safe and sound somewhere over the space," John explained.
Then he drank some green tea.