A Lesson in Cruelty follows Julian, an opinionated, arrogant, powerful man who has successfully attained money, power and control, "everything he's ever wanted," or at least, everything his heartless father taught the child Julian to want out of life. His bucket list is complete, save for one item, a birthday party. "Parties are for babies who will never amount to anything" is another lesson that Julian's father drummed into the head of the once innocent boy. Julian is ecstatic when he learns that his "friends" are throwing him a party for his 40th birthday. At the party, Julian is mockingly treated like the king he thinks he is, and the birthday boy eats it up. For Julian, it's the best night of his life. For the attendees, it's a combination freak show and intervention. As the night continues, the true purpose of the party unfolds... revenge. A dark, satirical joyride that uniquely blends the horror of "The Purge" with the humor of "Horrible Bosses" this gruesome black comedy is definitely not for kids.