Who bit the Apple?

I've been curious for a while now on this question.
Why does McIntosh apple (MAC) have to be half bitten and Who bit it?

Me came up with 3 random answers

A: Adam - bcos "we were born to break rules", in reference to christian's belief of Adam eating the forbidden fruit of knowledge (maybe an apple?) and hence the term Adam's apple. *shrug*

B: Isaac - bcos he got hungry after too much thinking, in reference to Isaac Newton discovering gravity.

C: An angry orange - in reference to my Photo5's 'Domestic Violence'

So...

do you think like a Christian, a Scientist or my friend?
Feel free to drop in more answers =)