Zach Galifianakis is sittin' pretty once more after this weekend.As Jeffrey Tambor said to him and Justin Bartha in The Hangover, "Never leave when you're on a heater."  Well, The Hangover's heater continues, as it took top spot once more with an estimated $33.4 million.  The Taking of Pelham 1 2 3 opened up at #3, disappointing for the studio, but in line with Screen Junkies readers' predictions.  Eddie Murphy's Imagine That opened with a paltry $5.7 million and the #6 spot.  Sadly, this probably means Norbit 2 has been fast tracked.  This Weekend's Top Five:1. The Hangover ($33.4 million)2. Up ($30.5 million)3. The Taking of Pelham 1 2 3 ($25 million)4. Night at the Museum: Battle of the Smithsonian ($9.6 million)5. Land of the Lost ($9.2 million)[Box Office Figures: Lee's Movie Info][Image: Flickr]