What makes a bad ending?

What makes a bad ending?

Russell Celyn Jones (Published writer. Professor of Creative Writing and Director of the MA Programme at Birkbeck College (University of London).) gives expert video advice on: Why can't I finish my novel?; I've lost track of my story how can I rescue it?; How do you keep track of your story? and more...

Well a bad ending is probably a Hollywood-type ending when, independent of what the story has been about, it ends with a kiss or a sense of happiness. Francois Truffaut once said that a comedy that ends in a marriage is a tragedy about to begin.