Story Idea

A man is married to a woman
The man dies
The woman gets remarried and has kids
The man comes back from the dead
He thinks he's still alive
He comes back to his wife
He meets the children and thinks it's his
He meets the other man and gets angry
He then realizes that the kids aren't his
He 'haunts' the family with rage, trying to kill them all
He manages to kill the other man and children
He tries talking to the mourning wife
But she can't hear him and he gets angry, trying to kill her
But she's so depressed that she kills herself
The man never realizes that he's dead and 'lives' depressingly...forever!

...or something like that...