You can shake the screen by zooming in at random spots in the span of 0.1 seconds each
@zoom on ____ in 0.1
@zoom on ____ in 0.1
@zoom on ____ in 0.1
@zoom on ____ in 0.1
@zoom on ____ in 0.1
Or you can have the zooms on the same line using THEN if you want to shake the screen while another command is happening:
&zoom on ____ in 0.1 THEN zoom on ____ in 0.1 THEN zoom on ____ in 0.1 THEN zoom on ____ in 0.1
If you want to use colorful transitions for an effect, you can transition in red/orange/yellow in less than 1 second to get that effect: What transitions are there?