Tom and Jerry: Blue Cat Blues

Blue Cat Blues is a 1956 Tom and Jerry short directed, written and produced by co-creators William Hanna and Joseph Barbera. The episode is known for its depressing storyline.

To cite Cracked for the episode's plot synopsis, "Tom and Jerry, get depressed, kill themselves".

Unofficial Ban
Due to the episode's references to alcohol and suicide, this episode rarely airs on television (though it isn't officially classified as "banned" by Turner to Warner Bros). However the episode is easily available to watch on home media (such as volume 1 of the Tom and Jerry Spotlight Collection).