Favourite scene would be the moe titan. Funniest I've seen in a while.
Levi Revaille is my bias just because he's really badass. He gives you feelings that you don't want.
ErEri as my ultimate SnK OTP because they're just perfect. A perfect S&M pairing. I crey.
I don't really have much information to give away if you haven't read the manga... Do you want a spoiler? D':