Despite a wave of new films the top three was familiar, as Universal's spy thriller The Bourne Ultimatum and New Line's buddy movie Rush Hour 3 swapped places from last weekend in a neck-and-neck race for second.
Bourne added $12.4m following a 38% fall for $185.1m after four weekends and Rush Hour 3 took $12.3m after dropping 43% for $109m after three respectively.
The best of the new releases was Universal's comedy Mr Bean's Holiday, which opened in fourth place on $10.1m. The film, already an international hit, stars Rowan Atkinson as the bungling ingenue and follows on from the 1997 release Bean.
The film is on the cusp of crossing $200m worldwide and stands at $199.5m.
Lionsgate's War (formerly Rogue) starring Jason Statham and Jet Li as high-kicking foes opened in fifth place on $10m, while The Weinstein Company's comedy The Nanny Diaries - which opened through MGM - launched in sixth place on $7.8m.
Warner Bros' sci-fi thriller The Invasion is struggling in its second weekend, ranking 10th after grossing $3.1m for $11.5m.
Estimated Top 10 North America Aug 24-26, 2007 Film (Dist)/Int'l dist/Est wkd gross/Est total to date
1 (1) Superbad (Sony) SPRI $18m $68.6m
2 (3) The Bourne Ultimatum (Universal) UPI $12.4m $185.1m
3 (2) Rush Hour 3 (New Line) NLI $12.3m $109m
4 (-) Mr Bean's Holiday Universal (UPI) $10.1m -
5 (-) War (Lionsgate) Lionsgate $10m -
6 (-) The Nanny Diaries (MGM/TWC) The Weinstein Company $7.8m -
7 (4) The Simpsons Movie (Fox) Fox International $4.4m $173.4m
8 (6) Stardust (Paramount) PPI $3.9m $26.5m
9 (7) Hairspray (New Line) NLI $3.5m $107.5m
10 (5) The Invasion (Warner Bros) $3.1m $11.5m