(A/N: It has come to my attention that the Fourth Doctor claimed to have done this, so it couldn't have been Ten, though at the time I wrote this I was unaware of that complication. Since I have not yet had a chance to view as much Doctor Who as many of you, this sort of thing may happen on occasion. Sorry if it bothers any of you.)
Gravity
It was a fresh, bright morning and the air was crisp in the heat of early summer. Isaac was in the orchard sitting under one of the apple trees with a book in his lap. His thoughts wandered away from the text as he took in the world around him for a moment. It was then that he heard the rustle of leaves. The noise was very soft, indeed so soft that Newton would not have heard it had he not been so alert. Straining his ears, Isaac heard the noise again, only this time he could discern that it was from above. While it was probably just a bird or squirrel, he looked up anyway.
The sight before him was quite unusual. There, in the tree above him, was a man perched precariously in the foliage. Newton took in his strange apparel; the man had the oddest coat he had ever seen and even odder shoes. Eventually they found their way to his hand, which was outstretched with an apple in its grasp ready to fall. On his eyes wandered to the man's face, which bore an expression much like that of a child caught stealing sweets out of the pantry.
"I can explain . . ."