Making a sequel to a movie is tricky business. Sometimes a movie is really good, it lends itself to a sequel, and it works out great. Toy Story 2, Godfather 2, and The Dark knight. But a lot of the time sequels are driven by money. When a movie makes a ton of money the studios can't resist going back to the well, even if it's a bad idea. And they keep going back until it totally bombs. The 2 Hangovers and the multiple American Pie sequels. 22 Jump Street, amazingly, is in the first category. It really shouldn't have worked. The genius of this movie is it completely makes fun of the idea of sequels and especially of itself. We know the problem with sequels and the movie knows we do. It is a complete inside joke and we are invited in to enjoy it.