Fallout

Unlimited turns (you can shoot the guys without them getting a turn to wipe you out)
Step one: Get into the combat mode. Step two: Take ammo for a gun and put it in to your hands (only ammo should be in your hand!) Step three: come close to a guy and click on target to shoot him! Step 
four: HE will say something like "Did your mama tought you that move?!" or something. 

Now you have unlimited turns, when you walk or shoot in combat your green circles shouldn't even move.