Action Movie FX by Bad Robot Interactive
Action Movie FX is an app for the iPhone that is pure entertainment. When using this app, you magically become a special effects film director. You begin by choosing a special effects scene (you can buy additional scenes) and create a short video recording of a scene where you want the effect to take place. You then decide on the timing of the effect (when the disaster or effect happens), render the file, and you're done. Very entertaining. The app is free, but you will definitely want to pay for some added special effects. The developers continue to issue updates since its inception in 2011.