What they should have done to make this a great movie...
They should have focused on the concept of "men in black". If, at the end of the movie, Johnny's faced opened with some steam coming, and some strange-looking alien creature (whose color is BLACK, of course) popped out of his head, this movie would have a great ending and everytinh would make great sense.
I've discovered the true meaning of life, but I cant tell you'cause its sooo dirty! ;)