If you scan the cast list for “Jack and Jill,” you’d be forgiven for thinking someone was punking you.

The actors in the film opening Friday are: Adam Sandler, Katie Holmes, David Spade, and — wait for it — Al Pacino.

Say what?

AL PACINO????!!!!!! Co-starring with Sandler and Spade and Tom Cruise’s wifey? In a movie where Sandler dresses in drag so he can play both a brother and a sister?

The mind reels.

But Pacino is just the latest example of the fine tradition of great actors slumming it. Hey, even Laurence Olivier deigned to appear in silliness like 1981’s “Clash of the Titans.”

Robert DeNiro is one of the few serious actors who has made the whole serious-actor-trying-kinda-lowbrow-comedies thing work, developing a whole side career in funny flicks. Granted, the last of the “Meet the Fockers” series was a bomb, but the first “Fockers” was such a hit that the follow-up attracted Dustin Hoffman and Barbara Streisand.

Other actors haven’t been as lucky as DeNiro. Nicolas Cage has gone slumming for a big paycheck — see “Season of the Witch” and “Sorcerer’s Apprentice” or, better yet, don’t — and he has seen his reputation suffer because of it.

What’s your fondest example of a great actor going slumming?