Surprises! I don't remember which episode, but she distinctly says she doesn't like to be surprised (as in party).
EDIT: Although, I don't think she doesn't say it out loud, she doesn't like it when other women hit on Clark.
VirginiaR. "On the long road, take small steps." -- Jor-el, "The Foundling" --- "clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.