Write a letter to an enemy
Here's a well used writing prompt, recycled for the first workshop of the 2017 series:
In 500 words or less express your contempt, reasoning or disillusionment toward your worst enemy. It could be an abstract member or the leader of an opposing military force like ISIS, Assad, or the Viet Cong. Or it could be a direct letter to just any Shitbag you've known. Set a stopwatch for 10 minutes. Write free verse or prose. Go.