The expressions simply check the velocity of your animations. If you move an objects motion ends abruptly (ie: you didn't easeIn @ 100%) the physics will kick in automatically.

Sliders hooked up to provide easy rotation looping.

Docucam is an After Effects preset loosely based on the excellent Docucam in CS Tools for C4D. The preset simulates handheld camera moves and more

In this After Effects tutorial Quba HQ will show you how to create your own highly customizable LED screen effect, ready to convert any text or image into pixelated goodness.

Layer blinking on and off via expression.

This script creates and animates a chain of 3D falling dominoes.

If you want to use the speed/velocity of a layer's movement to drive an effect ...

Film Burn is an Animation Preset that automatically creates the overexposed "roll-out" effect, where the tail (and the head if you want) of a clip flickers into overexposure. By Stu Maschwitz

These expressions save so much time, you might get home earlier tonight just by reading this.

In this tutorial, Levi Borland shows you a cool way to make it appear as though your character teleports out of the way of a speeding vehicle.