Good point, Fergie. We do see one example of Michael's playful side in a deleted scene from GF. He's in a hotel bed with Kay in NY. He convinces her to play a telephone operator, calling Tom Hagen "long distance" so Michael can tell Tom he's still in New Hampshire and will be at the Mall later. He and Kay giggle.

As far as I know, Michael makes one--count 'em, one--joke in the Trilogy. At his party in III, Johnny Fontaine sings "Salcicc' His Own" (a pun on "To Each His Own), and Michael leaves the room. He says he's going to the kitchen to get a "salcicc' sandwich." Yuck yuck.