*Snort!*

It's the throwaway lines that make Doctor Who the delight that it is. From "Circular Time" by Big Finish (a Fifth Doctor & Nyssa series of adventures):

THE DOCTOR: School children will remember how you saw an apple fall and discovered gravity!

ISAAC NEWTON: It hit me full in the face! My nose bled for three days!

THE DOCTOR: Ah. I've always been a fast bowler.