how can I shake the screen !!

[Greg]

Phizzy made this example:
http://phizzy.sitesled.com/tutorials/eathquake.mfa

I tried that example and that's normal scrolling :/ How to make earthquake in it? xD I pressed "+" and "-" but nothing happened.

[Sphax]

+ or - of your numpad.

[Mantis]

Nick: Precisely. The black border is what makes it unusable for most games. The only way to fix this is to give the frame, say... fifty pixels more width and height, have the frame centered on load, and then use most of the methods shown here.

[LaraSoft]

Or you could pick up the monitor and shake it around a bit

[X_Sheep]

Press + multiple times to see an effect.

[Cocodrilo]

Well, you could shake the screen by grabbing the screen with your hands and shake it .

[ChatGhosty]

Not if its a fat one. Maybe a plasma.