I just read a review by someone that called this movie offensive and disgusting. She also listed all the groups of people that it offends. More on that later.
This is the story of Billy Madison, a twenty-something man that is essentially an idiot because his wealthy father shielded him from failure as a kid. His father bought him good grades and so Billy never learned. He now spends his days in a drunken stupor with his two best friends. Billy's father announces that he will be retiring and because his son lacks the mental maturity to run a business that he will be turning over control to Eric, one of the upper management employees. Eric is kind of a douche and Billy is upset at his father's lack of faith in him. So Billy re-enrolls in elementary school to prove to his father that he can pass each grade, through high school. He is given two weeks to complete each grade. Eric launches a plan to see Billy fail.
This movie is hilarious, though it does scrape very low on the bottom of the maturity meter. The acting by Mr. Sandler is also not the best as this is his first staring role. It even has some heart warming moments. As I say all the time in my reviews, know what you are getting into before watching a movie and then leaving a bad review. If you are looking for a movie with deep meaning and Oscar worthy performances, then avoid anything by Adam Sandler. If you are under thirty and offended by the world, you too should not watch these movies.
To the person who wrote the review I mentioned at the onset of mine; you said this movie was offensive to teachers. It is a well known fact that Adam's mom was a teacher and this is her favorite of all his movies. Stop taking life so seriously and stop getting offended, Life is too short.