I'd have to say I felt this way about Martin Lawrence's Black Knight. That movie was the biggest pile of ---steaming pile of meadow muffin--- to ever grace the silver screen.
At the end, to spoil it for you, Martin's teacher and girlfriend both get killed. The teacher takes an arrow to the heart, and his girlfriend, I don't know, I forget.
Anyway, after that, he gets the RAGE to kill off the evil bad guy, like every other movie. When evil bad guy goes down, the two come back to life. No explination. The dude with the arrow in his heart just stands up like everything is cool. It was so retarded, I laughed for an hour afterwards.