10 Horror Movies That Only Make Sense At The End

Decades before Saw pulled off the "the dead guy was alive all long!" gambit, there was Diabolique. 

Henri-Georges Clouzot's legendary psychological horror film follows a cruel boarding school headmaster, Michel (Paul Meurisse), whose wife Christina (Véra Clouzot) and Nicole (Simone Signoret) apparently conspire to kill him.

And indeed, the duo do seem to drown Michel, appearing to make it look like a suicide, only for their plan to go awry when Michel's corpse inexplicably disappears.

Christina becomes increasingly fearful of Michel returning as a ghost, until in the film's climax his corpse reappears in her bathtub. 

Michel then rises from the tub, causing Christina to suffer a fatal heart attack out of fear - her heart condition having been established earlier on. What the hell is going on exactly? 

Well, Michel is very much alive and conspired with Nicole the whole time to stage his death and "haunt" Christina until she died of fright. 

It was almost the perfect crime, if not for the fact that detective Alfred Fichet (Charles Vanel) overhears their celebration and pieces the whole ruse together.