NEW: Harvard researcher beaten by a group of "clapping and screaming" teens in a movie theater after he told them to be quiet. 35-year-old Thiago Rentz is shocked that he got beaten after telling the teens to be respectful in an AMC Boston theater. "They were there disturbing all of the people, clapping and screaming all the time. I asked them for respect. I asked them to leave the theater because we just wanted to watch the movie," he said. When Rentz tried to leave the theater, the teens made a wall and refused to let him exit. "They just punched me. I didn't fight back. I was scared and then I just faced the wall, and I just protected my face in my head, but the target was obviously my head because they were punching my head and my face." Rentz says he is following up with the theater this week to make sure they are checking security footage.