One anime I'm ashamed I enjoyed was KissxSis. The show is about two sisters who love their younger brother and are wanting to marry him. The strangest part is that their parents approve of all of this.
Mine was My Bride is a Mermaid... It was cool at first and then went off the crazy scale big time! In the end I was like ummmm why am I still watching this...?? To Love Ru was really strange after a bit too.... Lol