Max Landis is the son of legendary movie director John Landis, but also a burgeoning screenwriter himself, having written recent-ish smash hit Chronicle. He also has a tonne of scripts in production. None of these, however, are the sort-of-terrible Super Mario Bros. script he wrote when he was 19 years old.
Landis has totally shared this script on his own website, which is glorious. Plenty of writers are quite content for the world to see them as shrink-wrapped geniuses, but by publishing his terrible Super Mario Bros. script he is showing aspiring writers that it is completely okay to suck in the beginning. Every one does. I don't know if I would be comfortable sharing anything I wrote aged 19 in a public space -- doing so makes you incredibly vulnerable.
In sharing this, Landis is really divulging and sharing his process. That's really a brave thing to do for a writer. This is the stumbling block, these are all the things he did wrong.
Also -- it's over 400 pages long. Typically movies go for a minute per page. Basically this means that Max Landis wrote a script for a Mario movie that would have lasted seven hours.
I like Mario more than the next man, but I don't think I could have dealt with that.
I don't know if the actual script itself is genuinely worth reading, but Max Landis' introduction to the script -- written in the present -- is unmissable. It details his mindset at the time, what he's learned since.
A must read for any aspiring writer.