Another method is the old Raymond Chandler advice: When things slow down, bring in a man with a gun. It doesn’t have to be an actual man with an actual gun, of course. It can be anything that bursts into a scene and shakes things up. Here’s the key: Get your imagination to give you the surprise without justification.
Make a quick list of at least 10 things that just pop into your mind. For example:
- A woman runs in screaming.
- The lights go out.
- A car crashes through the wall.
- Heart attack.
- SWAT team outside.
- Marching band outside.
- TV announcer mentions character’s name.
- A baby cries (what baby?).
- Blood drips down the wall.
- Justin Bieber comes in with a gun.
Some things on your list will seem silly. That’s OK. Don’t judge. Look back and find the most original item, and only then find a reason for it.