Along those lines, Douglas Adams wrote in Mostly Harmless, "a common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."
In the alternate ending, after the destruction of Earth, the description of the Babel fish from the earlier series is replayed with an additional section, which states that dolphins and Babel fish are acquainted, and that the dolphins' ability to travel through possibility space (first mentioned in The Hitchhiker's Guide to the Galaxy (novel) and elaborated on in So Long, and Thanks for All the Fish) is shared by the Babel fish as well.
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After the events in So Long, and Thanks for All the Fish, Arthur Dent and his love interest Fenchurch attempt to sightsee across the Galaxy, but when Fenchurch disappears during a hyperspace jump due to being from an unstable sector of the Galaxy, Arthur becomes depressed and travels the Galaxy alone, raising money to pay his passage by donating his biological material to DNA banks (mostly sperm, due to it having the highest payout).
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Later in the series, Ford is surprised to discover that all of his contribution had been edited back into the Guide, prompting his reunion with Arthur on the alternative Earth in So Long, and Thanks for All the Fish.
Her first major role was as Random Dent, in the radio version of Mostly Harmless the fifth series of The Hitchhiker's Guide to the Galaxy, as well as short film, feature, theatre and radio parts.