Strange equipment:-  Play map 51 in skirmish or link mode for Allied helicopters firing V2 rockets and Soviets with Allied tanks.

Super civilians:-  Play map 41 or 43 in skirmish or link mode for super civilians. The green civilians fire Nukes and the blue  civilians have Tesla Beams instead of pistols. Use a mad tank for maximum damage.

Transport soldiers with Chronosphere:-  Take a civilian and make it force fire on the soldier that you want to transport. When the soldier lies down, take the Chronosphere and zip it while avoiding the civilians bullets. This will work because the armor gets higher when the soldier lies down. Use this to send a spy or a thief into the enemy base. 

Double Tesla shock:-  Select the Tesla Coil and make it attack something. When the electricity is at the top (the ball at the very top), make it attack someone else. Practice this on your own units until you can master this technique.

Glitch: Infantry walks on water:-  You can make a infantryman walk on water by telling him to go into a transport ship. When he is just about to enter the ship, quickly pull it away. Then, once the unit is out as far as possible, repeat the process by putting a transport next to a man and telling him to enter, then pulling it away at the last moment. Now you can do this for some distance out to sea, but your man may get stuck and stay still.