Through the run of the show, I can think of three instances of Samantha being kind of nasty:

1.) Vandalized a house with a campaign slogan in "Remember the Main";

2.) Electrified a small child in "Tabitha's First Day in School";

3.) In the pilot, likely got an innocent maid fired from a plum job for dumping dinner into Sheila's lap.

Can anyone think of others?