"Alfred Hitchcock Presents" Shopping for Death (1956)

Two retired insurance salesmen have been visiting the scenes of accidents and crimes, feeling that they have a responsibility to learn why such things happen. One of them has found an aggressive, hostile woman whom he considers to be a prime candidate for a personal disaster. On a blisteringly hot day, the two follow her as she does some shopping, and watch as she antagonizes several persons. After some discussion, they decide to take a chance on helping her, and they go up to her apartment to talk to her.