1.50. A man kills his wife, then goes inside his house
and kills himself. (DH original, from “Nightmare in Yellow,” by Fredric
Brown)

1.50 answer: It’s the man’s fiftieth birthday, and in celebration of
this he plans to kill his wife, then take the money he’s embezzled and move
on to a new life in another state. His wife takes him out to dinner;
afterward, on their front step, he kills her. He opens the door, dragging
her body in with him, and all the lights suddenly turn on and a group of his
friends shout “Surprise!” He kills himself. (Note that the whole first
part, including the motive, isn’t really necessary; it was just part of the
original story.)