A gigantic technological marvel explodes in a single blast. There is a tremor in the Force. It's not someone's fault. One or more heroes are almost eaten by a Thing. A Jedi is much more powerful than he looks.
Someone does something apparently suicidal that turns out to be a good idea.
Twice if it's not Han. Someone is mind-controlled using the Force. A good guy wears white or a bad guy wears black. Three times if someone hovering in between wears gray. Every time you find yourself talking to the people on screen.