Nicolas Cage stands atop the domestic box office charts following a typically lacklustre post-Labor Day weekend that saw the action thriller Bangkok Dangerous launch at number one through Lionsgate on an estimated $7.8m.

There were no other new entries in the top ten as DreamWorks-Paramount's comedy Tropic Thunder ranked second on $7.5m for $96.8m after four weekends and Sony's comedy The House Bunny climbed one place to third in its third weekend on $5.9m for $36.9m.

The House Bunny traded places with Warner Bros' The Dark Knight, which grossed $5.7m for $512.2m after eight. Overture's Traitor held steady in fifth and has grossed $17.7m after two while The Weinstein Company's Vicky Cristina Barcelona slipped out of the top ten and stands at $16.1m after four.

The combined domestic box office was expected to fall just short of $66m as the session marked the seventh consecutive drop against 2007. Experts cited the flagging economy, the traditional post-summer slump, the start of the NFL season and severe weather in the Gulf states as reasons for the dull overall performance.

Next weekend's wide release is Focus Features' comedy Burn After Reading with Brad Pitt, John Malkovich, George Clooney, Frances McDormand and Tilda Swinton; Overture Films' thriller Righteous Kill with Robert De Niro and Al Pacino; Lionsgate's drama Tyler Perry's The Family That Preys starring Alfre Woodard and Sanaa Lathan; and Picturehouse's comedy remake The Women with Meg Ryan, Annette Bening, Jada Pinkett-Smith, Debra Messing and Eva Mendes.

Estimated Top 10 North America September 5-7, 2008
Film (Dist)/Int'l dist/Est wkd gross/Est total to date

1 (-) Bangkok Dangerous (Lionsgate) Initial Entertainment Group $7.8m -
2 (1) Tropic Thunder (DreamWorks-Paramount) PPI $7.5m $96.8m
3 (4) The House Bunny (Sony) SPRI-various $5.9m $36.9m
4 (3) The Dark Knight (Warner Bros) WBPI $5.7m $512.2m
5 (5) Traitor (Overture) Paramount Vantage Int'l $4.7m $17.7m
6 (2) Babylon AD (Fox) StudioCanal/Fox Int'l $4m $17.2m
7 (6) Death Race (Universal) UPI $3.6m $29.8m
8 (7) Disaster Movie (Lionsgate) Summit Int'l $3.3m $10.9m
9 (8) Mamma Mia! (Universal) UPI $2.7m $136.3m
10 (9) Pineapple Express (Sony) SPRI $2.4m $84.2m