What's the worst movie ending you've ever seen?

The Mist: In the end he drives his son and friends through a Land ravaged by a military accident which unleashed Monstrous cretures. They drive aimlessly in the hope to find Safety, but run out of petrol. They had a Revolver with 4 bullets left between the 5 of them. It was decided that the father would kill everyone, even his Child, and die alone. He shoots everyone, and gets out of his truck begging to die. Then out of nowhere, military personnal arrive, clearing the place of cratures. That was the worst ending I've ever seen in my life!!