Space Invaders Easter Eggs

Could this be the grand-daddy of them all?
It has been a long time since I saw this done. Like 15 years or more - I forget.
This is how I remember it;
In the first wave, shoot all of the aliens (including the saucers) except the second from the bottom... more

These games have a hidden message. To see it, wait until the demo starts and then press at the same time the keys left, right, fire, 1player start and 2player start. Press them repeatedly as fast as you can. After a few seconds a message apears under... more