Even though this age-old cups and ball hustler trick is done on a iPhone or iPad, see video: http://youtu.be/oKMJBowHxy4, it still require the magician to have quick hands and fingers to pull this off perfectly. Of course misdirection is also a key to this trick.

This iPhone will be free for download on 8th Aug so you can try it out to see if you like the effect or not.
The download link is: http://bit.ly/magic-cup

Regards,
Raymond