Two women are talking. One goes into the bathroom, comes out five minutes later, and kills the other.
Both women are white; the one whose house this takes place in is single. A black friend of the other woman, the one who goes into the bathroom, was recently killed, reportedly by the KKK (Ku Klux Klan). The woman who goes into the bathroom discovers a bloodstained KKK robe in the other's laundry hamper, picks up a nail file from the medicine cabinet, and goes out and kills the other.