As far as sadism goes I just can't get enough with messing with the guards in the Assassins Creed series and of course there is that trick where you can poison a guard, throw some money and have the guard mow down innocent civilians.
Thanks to Jar Jar we have one of the best Robot Chicken scenes of all time where Darth Sideous aka Palpatine calls Jar Jar to apologize for manipulating him and Jar Jar reveals himself to be a Sith and does an evil laugh.