I first chanced upon this 1956 French film by Albert Lamorisse on TV, and ever since I've been looking for a videotape or a DVD. Once I taped it from the TV station Arte, but they started early and I missed the start.
I wanted to have it for my children and myself because it's quite simply one of the best short films I can think of. For what it's worth, the film won a Palme d'Or at Cannes in 1956, and it's the only short film ever to win an Oscar outside of the short-film categories (for Best Screenplay, against La strada, The Bold and the Brave and The Ladykillers).
I'm not going to give anything away, because a first-time watching should be entirely from scratch. It's only 38 minutes long, and it won't matter a bit if you don't understand the French (there's next to no dialogue). I found it, finally, on Google Video, thanks to the excellent site Smashing Telly.
Albert Lamorisse, by the way, also invented the board-game Risk.