17 Again has a pretty original take on the do-over comedy you know, where someone, invariably a male, gets to go back in his life to do-over a key moment or event that continues to bug him. The twist here is that Mike O’Donnell doesn’t really go back in time: He is simply 17 again, the point at which, he figures, his life went south. So he winds up in high school with his own daughter and son, and his estranged wife can’t understand her weird feelings for this guy who reminds her so much of her ex when he was young.