If you knew that a friend or neighbor's partner was cheating on them, would you try to be the one to warn them? Even if it's someone you don't know very well, chances are you don't want them to catch their spouse in the act without warning.
A recent Reddit post shows a man talking to his neighbor through a doorbell video. Uploaded by a user who goes by ratihes to the Next F***ing Level Subreddit, the man in the video warns his neighbor that his wife is being unfaithful while he's out at work.