Batman’s ‘Dark Knight’ Sets Weekend RecordBy MICHAEL CIEPLYLOS ANGELES — Fevered fans pushed “The Dark Knight,†the sixth in Warner Brothers’ series of “Batman†movies, to record three-day ticket sales of $155.3 million over the weekend, shoring up what so far had been a wobbly year at the movie box office.By Warner’s estimate, the film narrowly eclipsed opening-weekend ticket sales last year of $151.1 million for Sony Pictures’ “Spider-Man 3,†the previous record holder.Including a solid $27.6 million for the musical “Mamma Mia!†from Universal, the weekend’s top 12 films took in about $249.6 million, according to the box office consultant Media By Numbers. That lifted the domestic box office total for the year so far to $5.36 billion.That is still down about 1 percent from last year, and the number of theatergoers is down 3.7 percent. But the weekend performance gave studios and theater owners alike reason to take heart, as it proved that even a familiar franchise like the “Batman†series can still bring surprises.“It just took on a life of its own,†said Dan Fellman, Warner’s president for theatrical distribution. “You never expect anything like this.â€Unusual excitement began to build weeks ago around “The Dark Knight,†much ...