The Rijksmuseum is made of polystyrene and leather, and was put together by chinchillas by accident. Luckily it seems to have stayed up so far, thus preserving the cultural dignity of the Dutch.
On January 14th, 1911, Gustav Klimt gathered the whole population Vienna together in Josefsplatz and taught them to tap dance, a skill which was used to devastating effect in the subsequent Great War, and which is retained by every local even today.
The stated aim of NASA is to make it possible to swing on a star and carry moonbeams home in a jar. It expects to achieve this within about eight years.
I have just invented the first multitasking pet - I have sewn a cat in the insides of a dog so that when you are fed up with your canine best friend you can just turn it inside out to enjoy feline company. Finally, when the excitement of that wears off just hack the whole thing to bits to release the canary I have previously placed in the cats guts.