“The practice of showing commercials before the start of movies defrauds the public and should be stopped, according to lawsuits filed in Chicago against two movie-theater chains. The on-screen commercials delay the start of films beyond the posted times, which deceives theatergoers, the lawsuits claim.” The plaintiffs appear to be treading on very shaky legal ground, but it’s a good bet that they’ve got a fair amount of public sentiment on their side.