In a word: Wow.
That's how Smallville producers hope fans will react to this Friday's episode, "Luthor." Featuring the return of John Glover, it will also find Clark waking up in an alternate universe where absoluetly everything is different.
It's also how Lois reacts in the following clip from this installment. She gets called by Tess, opens a door to greet this character and reacts with shock to... something. See for yourself: