Carnival in the Clothes Cupboard (1941)

A colorful cartoon commercial for soap flakes seems the last place that the realities of wartime life should creep in. A clothes cupboard opens to reveal a fantasy world where figures on fabric patterns come to life, and a neglected clown is shunned until he bathes in Lux Flakes. But in a last-minute coda, the clown returns to break the animated fourth wall and tell the audience that the product will not be made again till the war is over.

Unfortunately the movie Carnival in the Clothes Cupboard is not yet available on HBO Max.