"Will He Ever Get Off This Sequel Kick?" or "The best sequel that never was"

Continuing my pondering on the existence of sequels, I started to think about all the great filmed that deserved a sequel. It may be best that they didn't get them, however, since the sequel probably would've been done horribly anyway. Also, I'm too tired and lazy to number these, so following appear in no particular order.

Serenity- This was one of the most original and fun sci-fi movies in ages. If I don't get a sequel to this movie I may have to start a riot.

Unbreakable- while a sequel is completely out of the question, I would still love to see what happens next.

Spaceballs- We were supposed to see them again in spaceballs 2, the search for more money. While it was just a gag, it would be more meaningful now than ever before.

The Princess bride- again, unneeded, but it would still be cool.

Ferris Bueller's day off- I see this happening in one of two ways... ferris playing hooky from work, or ferris playing hooky from work in order to catch his son who is playing hooky from school.

The Phantom- The first movie is cheesy, but still way too much fun. With the generational hero trick, could be cool.

National treasure- face it, this generation needs an Indiana Jones series, and tomb raider ain't cutting it.

Bill & Ted (3) - Oh, the possibilities...

Sky Captain and the World of Tomorrow- this film was both inventive and amazing... I would love to have more adventures of sky captain.