Nothing is as it seems. For instance, Brockian Ultra-Cricket. Another case is the Earth. It was actually created by a race of hyper-intelligent beings to calculate ultimate question to go with the ultimate answer to life, the universe, and everything. However, five minutes before the critical readout, the Earth was destroyed by the Vogons employed by psychiatrists to make sure that people would never know the meaning of life and therefore would still be miserable and still pay the psychiatrists lots of money to talk to them. However, the dolphins for the Save the Humans foundation created a second Earth so the strange ape-descendent beings that roamed the surface of the supercomputer thought that it was all a hallucination.
However, two Earthlings had fled the Earth before it had been destroyed though; Tricia McMillian and Arthur Dent. Tricia, now called Trillian Astra, had escaped six months earlier with ex-president of the galaxy Zaphod Beeblebrox, and Arthur found out the day his home was to be destroyed that his friend, Ford Prefect, was not from Guildford but from a small planet that orbits Betelgeuse and they hitched a rid on a Vogon spacecraft. After that, they went on odd adventures involving saving the universe, Italian Bistros, and just plain improbability.
This is what happened after the Grebulon leader put on some light music.