Easteregg?

[Omni]

Well, there has always been this green icon in the lower right corner
of the world editor, you've probably seen it already.

you can click on it and the WE will say : "Gem Activated"
the icon will change into a (dark)purple gem.
If you click on that one it will deactive but anyway ;

Once this Gem is activated, place some unit in the map, select and
Delete It.
you'll see what happens next., the unit playes it's death animation with it's death sound =D

also when the Gem is activated and when you select a unit well...
a 5% chance that it will..

see for yourself, so the unit will say the usual things as 'is my aid required'<priest
i hope nobody knows this already (24/7 mappers probably do)
(YAAY SUMMER VACATION 8 WEEKS NOW I CAN MAP 24/7!!!)

 

[WindexGlow]

Diablo2 has this gem in the chat channels. But it did nothing.
Starcraft2 will likely have it.

 

[mr-death]

They do their death animation

 

[Geelottaja]

This is a quite well known fact, use search for it. Also, click on the gem multiple times in a short perioid of time and you'll hear some comments etc.
Just search it.

 

[esb]

Also, if you have it activated, besides hearing death animations when deleting a unit, if you click on a unit, sometimes their voice sounds