A Harvard researcher was brutally attacked by a gang of teenagers at a Boston movie theater after he told them to be quiet during a screening. Thiago Rentz, 35, was seeing a late-night showing of the new horror film Weapons at the AMC Boston Common 19 last week when things got frightening off-screen. A group of five teens in the theater loudly clapped and screamed throughout the screening, ruining the experience for everyone, Rentz said.