When I was in college, one of my professors would always say "That's one of those naughty passages" when there was a verse or section that often spurred debate. What are some of your favorite "naughty" passages?

Mine is Ephesians 2:8-10 "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. For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do." (NIV)

It brings up the debate of whether or not God planned everything or gave us free will, grace vs. works... there's so many good things to discuss!