A tough cop’s (Sylvester Stallone) seemingly frail mother (Estelle Getty) comes to stay with him and progressively interferes in his life. She buys him an illegal MAC-10 machine pistol and starts poking around in his police cases. Eventually, the film draws to a denouement involving the title of the film and the revelation that even though she seems frail and weak she is capable of strong actions in some circumstances, i.e. when her son is threatened by thugs and she shoots herself in the shoulder.

When Johnny is released from prison following a forgery charge, he quickly lands a job as a short-order cook at a New York diner. Following a brief fling with waitress Cora, Frankie develops an attraction for Cora’s friend and fellow waitress Frankie. While Frankie resists Johnny’s charms initially, she eventually relents when her best friend, Tim, persuades her to give Johnny a chance.

After a young man is bitten on the hand by a radioactive snake, his hand changes into a lethal snake head, which attacks everyone he comes into contact with. Also, his body becomes filled with snakes. Now, he must prevent himself from hurting others.

Cult classic starring Ralph Macchio as a want-to-be blues guitar virtuoso who seeks a long-lost song by legendary musician Robert Johnson.