Answer:
"Mrs. Tylor recognized finally the faint nervous feeling that was tagging her; it was the way she felt when she was irrevocably connected with something dangerously out of control ..."
Mrs. Tylor, 169
In "Of Course," Mrs. Tylor eagerly befriends her new neighbors, only to discover that they are not people with whom she would ordinarily like to be acquainted. However, due to the unspoken restrictions of suburban conformity, she is unable to express her true feelings. Mrs. Tylor realizes that she has been caught in the societal trap of politeness and conformity, which are "dangerously out of control" and suppress individuality.
"Although the villagers had forgotten the ritual and lost the original black box, they still remembered to use stones."
Narrator, 218
This sentence neatly encapsulates the full extent of the villagers' mindless cruelty. They have forgotten the less horrific and murderous aspects of the lottery and do not care about its niceties. Instead, the villagers are focused on the end result, which is to kill one of their own, for no reason. Jackson thus depicts the villagers' ability to discard the pretensions of civilization in such situations and opt instead for mindless brutality.
"Or maybe he just got [the letter] and said, Oh, from Jimmy, and threw it in his brief case and forgot it. I'll murder him if he did, she thought, I'll bury him in the cellar."
Narrator, 209
In "Got a Letter from Jimmy," Jackson offers a glimpse of the unexpected brutality to be unleashed in the next, final short story in the collection, "The Lottery." Over a seemingly ordinary meal with her husband, a wife actually harbors murderous thoughts. The scene set by Jackson is easily identifiable to most readers, but she jars the illusion of domestic happiness by revealing the narrator's unseemly thirst for murder.