Strangers on a Train (1951)

Strangers on a Train
Crime, Thriller
Having met on a train, a smooth-talking psychotic socialite shares his theory on how two complete strangers can get away with murder to an amateur tennis player — a theory he plans to test out.
Starring
Farley Granger, Ruth Roman, Robert Walker, Leo G. Carroll, Patricia Hitchcock, Kasey Rogers, Marion Lorne, Jonathan Hale, Howard St. John, John Brown
Directed By
Alfred Hitchcock