This is a terrible movie, but I have to admit that I laughed a lot.
Adam Sandler plays both Jack and his twin sister, Jill. Jill comes to stay with Jack and his family for the holidays, and Jack hates every minute she is there. Jill is in incredibly obnoxious character. In fact she is so obnoxious that it's hard to believe her as a character at all.
No human who has ever lived is this dumb and clueless. She answers her cell phone during a movie and speaks at full volume. She whispers offensive things at a dinner party that the entire table can hear. She drives a jetski in a swimming pool. The character exists so Adam Sandler can play a woman. If you have heard his comedy CDs, you will recognize the voice he is doing. It's also reminiscent of the shopping mall girl he used to play on SNL, along with David Spade and Chris Farley. Spade shows up in the movie (also playing a woman), and oh how I wished Chris Farley were still alive.
Al Pacino is in the movie, playing himself. The story is about how Sandler's character, who runs an ad agency, is trying to get Pacino to appear in a Dunkin Donuts commercial. Pacino is having some kind of nervous breakdown in the movie, and he develops a strange attraction to Jill.
The Pacino stuff is pretty funny. My favorite scene involved Pacino answering his cell phone during a play, where he is the star. Pacino does a good job in the movie, but my heart sank at the end when we see the commercial he does for Dunkin Donuts. He basically craps on his entire legacy during a 2 minute musical number where he quotes his most famous lines. For shame.
The most annoying thing in the movie for me was the twins' language. Jack and Jill speak to each other in a language only they can understand, and it's so annoying it made my teeth hurt.
So the movie is as bad as the trailer suggested, but there are laughs to be found. Oh, and like all Happy Madison productions, there is fart and poop humor in the movie too. Enjoy!