For some reason, Julia consistently refers to her forehead as her "two-head". As in, "I bump my two-head!" I'm not sure how this came about...maybe she thinks it's called that because she's two. After all, two IS her favorite number.
Being the big brother that he is, Will set about to correct Julia about foreheads:
"Julia, it's not called a two-head. It's a FOREHEAD. Do you know why it's called a forehead? I think because it is FOUR inches high. Or wait...maybe it's because it's four inches from your nose. But, it's FOREhead, not two-head."
Gotta love four-year-old logic. Good thing he's around to impart this wisdom to his sister.