Harry Potter and the Deathly Hallows — Part 2
Harry Potter is one of the biggest franchises ever, but people didn't love the final scene of the final film. Namely, the jump from finally defeating Voldemort to sending his kids off to school. Also the names...James Sirius, Albus Severus, and Lily Luna. Yikes!
The Mist
Is there any more heartbreaking ending than that of The Mist? The main character mercifully kills his family in order to spare them from the mist. In less than a few minutes after doing so, the military comes to save them all. It was a tough type of cruelty.