How does one make a sprite "jiggle"?

I was wondering if there was a effect or behaviour that basically makes a sprite jiggle, kinda like this:

Tween?

Looks like animation to me. Just copy your sprite and move it 10 pixels right and up and then 20 down and left and then back to center although that looks like they use a little bit of squish and squash too

In the second example, the "jiggling" looks like a slight widening of the sprite.

Thanks to the Timer behavior you can modify your sprite's width for a few milliseconds. I guess you could also use the Sine behavior (with a very short period) and activate it only for 0.250 seconds for example.

Example made in Beta release r228