The Expendables dropped 50 percent to $24.1 million for a two-week total of $72.5 million. This decline was about the same as that of last August's men-on-a-mission movie Inglourious Basterds, though Expendables' total trails Basterds by $7.7 million through the same point.
Eat Pray Love finished third for the weekend, but held well enough throughout the week to move up to second place. The Julia Roberts globe-trotting drama dipped 47 percent to $18.6 million for a two-week total of $53.7 million, which was ahead of Julie & Julia's $50.3 million two-week tally last August.
Vampires Suck dropped a spot from the weekend, ending up in third with $16.2 million for a nine-day total of $22.6 million. This was lower than Date Movie, Meet the Spartans and Epic Movie, though it marked a significant improvement over Disaster Movie.
The Other Guys finished in fourth for the week, down 43 percent to $14.6 million. With $92.7 million in three weeks, The Other Guys is poised to become Will Ferrell and Adam McKay's third-straight collaboration to top $100 million.
Piranha 3D had the second-biggest debut, earning $14 million in its first seven days. This was way lower than Snakes on a Plane, though, and was also the worst-ever opening week for a 3D movie playing at more than 2,000 theaters.
Thanks to low mid-week attendance, Lottery Ticket fell two spots from its fourth place weekend finish. The comedy scored a $13.4 million start, which trailed First Sunday and Welcome Home Roscoe Jenkins but was ahead of Johnson Family Vacation and The Cookout.
Nanny McPhee Returns switched spots with The Switch, moving up to seventh for the week on a $12.3 million launch. This was off over $4 million from the original Nanny McPhee's $16.7 million start in January 2006.
The Switch turned out to be the biggest loser among the new releases, settling for eighth place with $11.8 million. This was a slight improvement on Love Happens but was still much lower than most Jennifer Aniston vehicles.
Inception had its best hold yet, off just 33 percent to $11.5 million. The Christopher Nolan mind-bending thriller has earned a massive $265.6 million in 42 days.
Scott Pilgrim vs. the World rounded out the Top Ten, down 49 percent to $8 million for a two-week total of $23.7 million. On Thursday, it edged past Hot Fuzz to become director Edgar Wright's highest-grossing movie, though Pilgrim still has a long way to go before it's considered remotely successful.
• Weekend Report: 'Expendables' Battle On, 'Vampires,' 'Piranha' Settle for Scraps
• Weekly Box Office, August 20-26
• Daily Grosses
• All-Time Domestic Grosses