Darth Vader obviously used his skills for evil. His most used and most famous attack is called the Force choke.
(Darth Vader using his Force choke skills)
You don't need to be a Jedi or a part of the Sith to practice the Force choke. With a little creativity and special effects, you can be "Vadering" in no time.
What you need:
An iPhone or camera
A friend(s)
How to:
1. Position yourself so your friend is in the full frame of the camera screen.
2. Have your friend(s) pose with their hands on their throat, as if you were chocking them.
3. On the count of 3, tell your friend(s) to jump.
4. Snap picture.
The end effect should be something like this...
("Vadering" example)