I did a project about Walt Disney The Man® way back in 3rd grade. Two things he did really impressed me.
First, every night after Disney World closed he would walk around and clean the park. This includes scraping gum off of the paths. The man was a perfectionist.
Second, he created the MultiPlane camera. This added depth to animation AND CHANGED THINGS FOREVER. I had never seen any video of the camera in action until yesterday when someone* sent me this video. The way he explained things is pretty excellent.
*can't remember who, sorry.