With a novel, you have the reader with you a lot longer, and you owe him a lot more. Obviously you have to have a plot - I say "obviously," although I think a lot of fiction doesn't, and nothing seems to happen. But to me, there should be something that happens, and it should be at least vaguely plausible. And because the readers are going to be with these characters for a long time, you have to get to know them and like them and want to know what happens to them.
Dave BarryHere in Miami, on weekends, amusement-seekers will come to the marina, set up folding chairs, and spend a highly entertaining day watching boat owners perform comical maneuvers such as forgetting to set their parking brakes and having their cars roll down the ramp and disappear, burbling gaily, below the surface.
Dave Barry