One of my favorite pinball games with the electromagnet was Addams Family. When you had two out of three balls for multiball it started spinning under the table, making the ball path erratic. It continued through the multiball until you were dead. It also came on during the "Seance" bonus game, where you had to go up the bear ramp 3 times to finish. The Adams Family is one of the most popular pinball games of all time, btw.

Theatre of Magic was also an excellent pinball game.