Keeping their promise to pop in at random screenings of their new hit film, Jonas Brothers made a surprise appearance at the Rave Motion Pictures movie theater in Las Vegas' Town Square mall on the night of March 1. "They snuck in and sat down with the crowd like they were regular people," an eyewitness tells In Touch. "Everyone freaked out when they saw who sat next to them!" Rock stars Joe, Kevin and Nick, whose film Jonas Brothers: The 3D Concert Experience opened nationwide on February 27, were swarmed by the shocked audience. "They went to the front of the theater and thanked everyone for coming," the onlooker adds. The boys previously stopped by a West Nyack, N.Y., theater on February 28 after announcing their partnership with NetJets to make the secret theater stops.