Tina Fey's cliquish teen satire Mean Girls opened at No. 1 over the weekend with $25 million — more than double expectations. Last week's top flick, Denzel Washington's thriller Man on Fire, slipped to No. 2 with $15.2 million, followed by the Jennifer Garner comedy 13 Going on 30 ($10 million). Elsewhere, three other newcomers — Laws of Attraction, Godsend and Envy — collected a mere $20 million combined.