“Did you know the dogs on the planet Barcelona smell with their ears?” the Doctor said to Donna one day.
“Their ears? Come on, you’re ‘aving me on.”
“No, it’s true; they don’t have noses so they have to use their ears instead. And on Feltscham Prime, the people have their eyes in their knees. The cloud cover’s so low they wouldn’t be able to see where they were going otherwise.” The Doctor beamed at Donna. “Isn’t that brilliant? Oooh, and the natives of Beeglesnurf drink with their noses! Imagine that!”
The Doctor was a mine of completely useless trivia.