In this After Effects tutorial Brad Chmielewski shows you how to add an expression to your footage that will drop every 10th frame.

A preset to drop a text in from the capline in a swinging motion and then swing back and forth at the bottom as it loses 'momentum.' Like int the opener from the movie 'Stranger than fiction'

The Difference Matte effect creates a transparency a mask or a matte by comparing the pixels in a source layer with the pixel in a defined difference layer, and then keying out (eliminating) pixels in the source layer that match both the position and color in the difference layer.

This is a variation on the pendulum expression.

Keyframes were applied to Jack's position at frames 0 and 1 to move him out of the box