A flock of small birds goof around on a telephone wire, tease a large flamboyant bird (who is basically their Jar-Jar Binks), then wind up with their feathers floating in the air, and Jar-Jar bird laughing at them.
The animation itself was a new challenge for the Pixar team, who had to figure out how to animate all those individual feathers, and their efforts were rewarded with an Oscar for animated short. Though they've topped themselves since then, this is still one of their most memorable and re-watchable little outings.