If you could see one canon crossover, what would it be?
The principle is simple.
The author of both series -- either anime, manga, or a mix of both -- get together to create a two hour motion picture, which would be recognized as a canon crossover.
Note: No character inconsistencies or plot induced stupidity is allowed. If it's a movie featuring a battle between Goku and Naruto, then expect the battle to be short.
So what anime or manga would you pick?