"Oooooo! A water park! The TARDIS already has a swimming pool, but a water park? With crazy slides and wave pools? What a great idea! I'm glad I came up with it!" He smiled, then gave Bill a wink, acknowledging that he'd gotten the inspiration from her.
It was the mention of Willy Wonka that made the Doctor go still. He hadn't seen that film in a very long while, and he needed to think about what Bill might be referring to. It didn't take long before a crazy grin stretched across his face. "You just might be on to something, there, Bill. Although, I'm not sure a I'd want a chocolaty wonderland room in the TARDIS running all the time. Maybe for special occasions. My previous regeneration would've been all into it, though. Good thing I didn't think about it then."