Occasional Superheroine points out that 2007 marks the 50th anniversary of What’s Opera, Doc?:

“Opera” is more than just an icon of several generations’ childhoods; this piece is perhaps Jones’ best work, and was voted the #1 animated short of all time by a poll of animation pros. Jones is also the only animator with three shorts selected for preservation in the National Film registry; the somewhat surreal One Froggy Evening (YouTube) from 1955 and the fourth-wall-demolishing Duck Amuck (YouTube) from 1951 round out his trifecta (they are, incidentally, #5 and #2 in the aforementioned greatest-cartoon list). Enjoy.