Whatever it was raced across the sky in monstrous yellowness, tore the sky apart with mind-buggering noise and leapt off into the distance leaving the gaping air to shut behind it with a bang that drove your ears six feet into your skull.
Another one followed and did the same thing only louder.
It's difficult to say exactly what the people on the surface of the planet were doing now, because they didn't really know what they were doing themselves. None of it made a lot of sense — running into houses, running out of houses, howling noiselessly at the noise. All around the world city streets exploded with people, cars slewed into each other as the noise fell on them and then rolled off like a tidal wave over hills and valleys, deserts and oceans, seeming to flatten everything it hit.
Only one man stood and watched the sky, stood with terrible sadness in his eyes and rubber bungs in his ears. He knew exactly what was happening and had known ever since his Sub-Etha Sens-O-Matic had started winking in the dead of night beside his pillar and woken him with a start. It was what he had waited for all these years, but when he had deciphered the signal pattern sitting alone in his small dark room a coldness had gripped him and squeezed his heart. Of all the races in all of the Galaxy who could have come and said a big hello to planet Earth, he thought, didn't it just have to be the Vogons.
Still he knew what he had to do.Everything was ready, everything was prepared.
He knew where his towel was.