Important Health Warning:


If you have not yet finished Mostly Harmless, the fifth book in The Hitch-Hikers' Guide to the Galaxy trilogy, you are advised to leave this node immediately as it will completely ruin the plot and negate the mind-screwing effects of the book. Thank you for listening.

In Mostly Harmless, Stavro Mueller Beta is the name of a club in London in which someone tries to shoot Arthur Dent, but he ducks and the bullet instead hits and kills Agradjag, who for some reason is unendingly killed by Arthur Dent every time he is resurrected.
The significance of this is that in Life, the Universe, and Everything, the third book in the trilogy, Agradjag tries to get revenge on Arthur Dent but cannot because he has not been to Stavro Mueller Beta and thus must in future be there in order to indirectly kill Agradjag. Therefore, Arthur Dent's life is assured until he reaches this place, and constantly asks about its location so that he can avoid it.
However, because he has only heard the name spoken out loud, he cannot look it up, and reaches this club believing it to be some planet somewhere. When he gets shot at there, and ducks leaving the shot to kill someone else, he finally realises and goes into shock, just in time to see the Earth getting blown up (again).
This also explains why the bowl of petunias says "Oh no not again" in book one.