Destino

Years ago, I heard that Walt Disney and Salvador Dali had planned to collaborate on a film together, but nothing came of it but a bunch of sketches.  Decades later, the film finally got made:

https://www.youtube.com/watch?v=aXa8s9R7-24

 
It's every bit as weird as you would expect.  There's a bit more information about it here (good old Wikipedia!):

http://en.wikipedia.org/wiki/Destino