Reese Witherspoon's Chin Defies Mathematical Explanation (and Probably Logic)

Reese's chin makes watching "Walk the Line" damn near impossible. (Thanks Emily for pointing it out- I think I have gone insane!) Her chin shoulda got that Oscar! That chin is so BIG and yet so tiny at the same time. Does it exist in four dimensions? Five? How is this possible?
Clearly, she is a witch!