My favorite Bible verse would have to be Ephesians 2:8-9, "For it is by grace you have been saved, through faith - and this is not from yourselves, it is the gift of God - not by works, so that no one can boast."
I'm not sure why this is my favorite verse. I grew up going to Awanas every Wednesday night, and of course as soon as I finished one book I went to the next and to the next. Then I started back at the beginning with the books for the Sparks since Awanas wasn't around when I was that young. I truly memorized a lot of those verses and not just remembered them long enough to recite them. But for some reason this verse is the one that I remember the most!