A fun list. The only beef I have with this is that, IMHO, Airplane! should be number 1. You talk about Walk Hard destroying the musician movie formula. But Airplane! killed the disaster movie genre, and spawned a whole book of quotes that have become part of our satire lexicon. And Airplane! spawned a whole new genre of spoof movies, including The Naked Gun and its sequels.

Also a shout out for Sharknado, and Attack of the Killer Tomatoes, although Sharknado was semi-serious, more like a spoof of itself.