I stumbled upon this little trick unexpectedly. yesterday when I was toying around with the editor, I made player one a spanish wonder in the middle, a wall of bombard towers around it, then walled everything in with fortified walls.
I placed an unit near it, and set up a trigger in which change the wonder-wall-tower structure from player 1(blue) to player 2(red), and the results were unexpected. blue is a color of pure good and red is evil. when the change was made, half-a second of light flash and a rolling sound of thunder was formed, it\'s cool, check it out!!!
I highly suggest you download this, since it\'s only about 1.25kb. check it out!
Excellent discovery! People, this is not a fortress template, this is a hidden gem! When you change a P1 wonder to a P2 wonder with triggers, it automatically makes the screen flash and makes a thunder sound. Perhaps it could be used so when a wizard casts a curse on u in an RPG, the screen flashes. At the time when the thunder would have rolled, you could play a explosion sound to drown out the thunder.