The Rape at Bethlehemjudah (Judges 19) - By far, this story is probably the most grotesque chapter I've read yet. It doesn't involve the slaughter of thousands, but involves the gangrape of [almost] two women. As Joseph Stalin said, "You kill one man (or gangrape one women), it is a tragedy. You kill 10 million, it is a statistic."
What is even worse is the implication at the end of the chapter that what happens is moral. Verse 19:30 says, "... consider it, take advice, and speak your minds." I invite you to speak your mind as well.
Essentially, this is what happens in Judges 19. A Levite man and his concubine seek shelter at the house of an old man and his virgin daughter. In a story almost eerily similar to that of Lot, a group of horny dudes surround their home and demand to have sex with the old man's guest. Instead, the old man offers his virgin daughter and the Levite's concubine.
To quote him, he says, " Nay, my brethren, nay, I pray you, do not so wickedly; seeing that this man is come into mine house, do not this folly. Behold, here is my daughter a maiden, and his concubine; them I will bring out now, and humble ye them, and do with them what seemeth good unto you: but unto this man do not so vile a thing."
While the gang of men refused the daughter, they took the concubine and abused the poor woman throughout the night and morning. During the concubine's night of terror, the Levite apparently had a blast hanging out with the old man.
The next day, she laid in front of the door of the house - presumably a ragged mess. The Levite picked her up, put her on their donkey, and went home. At home, he took out a knife and then carved the concubine into 12 pieces, which he had sent to "all the coasts of Israel."