This is probably Frederick Winsor's most famous Whimsy.
The Hydrogen Dog and the Cobalt Cat
The Hydrogen Dog and the Cobalt Cat
Side by side in the Armory sat.
Nobody thought about fusion or fission,
Everyone spoke of their peacetime mission,
Till somebody came and opened the door.
There they were, in a neutron fog,
The Codrogen Cat and the Hybalt Dog;
They mushroomed up with a terrible roar --
And Nobody Never was there -- Nomore.
"The Space Child's Mother Goose" 1958
