This 7 minutes cartoon (directed by Chuck Jones) is in my opinion the best cartoon ever made. Chuck Jones was a genius who directed and/or animated most of the Looney Tunes cartoons. I'm not sure why this cartoon has appealed to me over the years, but it has been my favorite since the very first time I watched it as a kid.
If you have buffering problems with the video (because it is long) press play, then pause and let it download completely before watching (then hit play again!).