The trailer for the new Ben Affleck movie, "The Town," isn't on the Web yet. The movie's scheduled to open Sept. 10. The trailer was shown before the advance screening of "Inception" last night. Jeremy Renner looks scary. Rebeca Hall, being Rebecca Hall, looks wonderful, and the whole thing goes on way too long. What makes the trailer worth noting is how at one point a character in voiceover says something to the effect, "There are 300 bank robberies attempted in the Boston area each year. Most of them are committed by people who live within a single square mile, in a place called Charlestown." Well, the AMC Loews Boston Common, where the screening was being held, is about a mile and a half from Monument Square. The theater was packed. You can imagine the response when "Charlestown" was spoken As Tip O'Neill might say, "All laughter is local." Presumably, an audience on Pandora watching a trailer for "Avatar" would have reacted much the same way.