Mother-son duo's struggle to create China's worst film goes viral after it earns $3 million

'Niu Lai', created by Xin Yumeng and his mother Sun Lifan, has become a $3-million blockbuster after being called 'worst Chinese film' for its poor animation. The mother-son duo's struggle to make the film has gone viral. With almost negligible $200-budget, Lifan taught herself 3D animation, voiced the characters and sang the theme song to make Yumeng's dream come true.