Throw Momma from the Train (1987)
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Larry Donner, an author with a cruel ex-wife, teaches a writing workshop in which one of his students, Owen, is fed up with his domineering mother. When Owen watches a Hitchcock classic that seems to mirror his own life, he decides to put the movie's plot into action and offers to kill Larry's ex-wife, if Larry promises to murder his mom. Before Larry gets a chance to react to the plan, it seems that Owen has already set things in motion.
Throw Momma from the Train - watch online: streaming, buy or rent
You can buy "Throw Momma from the Train" on Apple iTunes as download or rent it on Apple iTunes online.