This creates a random jittery motion in the Y axis. You can modify probability to make or less jitter, and the pos variable to define how large the jitter is.

If you would like a layer's position to wiggle in 45° degrees for example.

Another cool use of the "linear" Function

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

So, where exactly is the secret menu? It is right in front of you, in the main Radio Waves Effects Panel, but it is hidden in the form of Frequency, Opacity, Fade-in and Fade-outs.

Earthquake effects on fullscreen video clips

You know the good old movies shown in an old flickering and not very well timed film projector where you can see the different frames scrolling.

If you want an abrupt change in value, but not on every frame, you could use this expression.

If you wanna wiggle something, and have it be loop-able (for motion backgrounds and whatnot) this is the code for you.

This creates a “ follow the leader” effect that works from the bottom up. A follower will tag
along after the previous layer, deviating from the previous path according to the wiggle
properties that are specified in the inputs.