But the principle applies to far more than devices as dramatic as a gun on the wall. There are a million ways for stories to promise resolution, and great storytellers must understand how to use them in order to subtly, naturally provoke audience investment, while avoiding the sense of betrayal invoked when those guns are not fired. Ah shit, time for a beachfront concert! See, something sweet is always going on here. The two of them are criminally adorable together.