Butch Cassidy and the Sundance Kid.
Seriously though Strube, my favorite movie of all time is "Three Days of the Condor" and they had to condense the book for the movie. There was a semi sequel with Robert Redford called "Sneakers" different movie but same character for Redford. Max Von Sydow was awesome in that movie BTW.
Okay movies I want sequels to.
"Serenity" the firefly movie.
Another "Cube" movie to come out (one of the greatest hardly known "horror" movies to ever come out)
"Eragon" the movie just left you hanging, and since it did so poor, no sequel is planned.
"Office Space"
"Pan's Labyrinth" deserves another chapter to this great movie.
"3:10 to Yuma" - what does Russell Crowe do after boarding the train and calls his horse.
"The Prince of Darkness" a John Carpenter horror classic, that just ends, making you wonder when you look in a mirror, just what exactly is looking back from the other side.
"Big Trouble in Little China" bring Jack back and his "Porkchop Express" we saw the creature on the outisde of the truck, but nothing more.
"Shoot Em Up" with Clive Owen, this one needs a sequel.
"2060" Arthur C Clarke wrote the novel as a "conclusion" to 2001 and 2010, but no movie yet. His novel 3010 as a "finale".
"Remo Williams the adventure begins" Still waiting for it to continue.
"Equilebrium" cause we all need our fix of "Gun Kata (would love for this to be on Bluray)
I'm sure there are many more, but all I can think of right now.