This one is pretty special. You will laugh, you will facepalm, your jaw will hit the floor.
The Thief and the Cobbler, or Arabian Knight, or The Princess and the Cobbler, or Once, OR The Amazing Nasrudin is, to date, the animated movie with the longest production run in history. It was begun in 1964 and released (after a fashion) in 1993... and then again in 1995.
A cautionary tale for studios and a treasure trove of interest to animation experts, the story within the film itself pales in comparison, in terms of fascination, to its dreadfully staggered road of creation.
This is the story of one unusual man who dreamed of making the finest animated film the world has ever seen, and what happened when that dream came up against reality.
If you would like to see more about this film (once you've seen the film, because I'm betting you hadn't even heard of it until today) you might want to catch this in-depth documentary *Persistence of Vision*, which features an array of animators and others involved with the making, and in which they are far more complimentary of the film than we are.