In Star Wars: The Force Unleashed 2 for the PS3, and Xbox 360, there is an achievement / trophy called Strike where you have to kill three stormtroopers with a “ball”.
On level two you’ll find a casino area with a golden ball in the center of the room. Pick up the ball, and try to force throw it at a group of stormtroopers to kill at least three in a single hit.
A lot of people are reporting problems with this one, since the ball doesn’t always kill them in one hit. Some have reported that using Force Fury can help with this problem. If you don’t get it in a few tries, restart to your checkpoint and keep trying.