No matter how much we love a movie, most of us don't ever read the screenplay -- after all, isn't the whole point of going to the movies to avoid reading? (Unless you like foreign films, like some America-hating commie.)
Well, it turns out there's a lot of insanity hidden in the scripts for even the best movies. This is probably because in the days before screenwriting software, it was easier to just leave some ridiculous bullshit scene in than try to go through the torture of manually fixing it with a typewriter. Ridiculous bullshit scenes like ...
Ferris Bueller's Day Off Had A Bizarre Strip Club Scene
Ferris Bueller: He's the lovable scamp who betrays the sympathies of an entire school so he can gorge himself in fancy restaurants, act like a jackass on parade floats, and generally drive his best friend closer and closer to the brink of suicide. Nevertheless, it's a beloved treasure of a movie, inspiring a sitcom, commercials, and a generation of kids to abandon their education for no good reason.
The screenplay is pretty close to the final movie, with tiny exceptions like Ferris stealing money from his dad and Charlie Sheen's character driving the entire narrative. However, since John Hughes banged the script out in less time than it took to write this article you're reading, there were understandably some kinks to work out -- such as the scene where Ferris visits a fucking strip club, jumps on stage, and pulls off the most boner-killing Elvis impersonation ever written.
Of course, it may not have felt like a crazy tonal shift, thanks to the magic of editing:
Wait, is this a script or free association poetry?
It's a pretty weird deviation to go from the "live life to its fullest" ethos of visiting the Sears Tower and touring the Art Institute of Chicago to the "live life spending a sunny day inside a dank, neon-filled pit of debauchery" ethos of this scene. Presumably, Ferris thought it was a necessary detour after Cameron nearly burst a blood vessel trying to mentally undress the women in a Seurat painting.
It's basically this, but with "Cherry Pie" playing in the background.