For those who don’t recognize this, it is a quote from the Hitch-Hiker’s Guide to the Galaxay [1]. The context is: Ford is an (intelligent) hitch-hiker and CHAIRMAN and MARKETING GIRL are parts of the "useless third" of the population of Golgafrincham (basically, middle managers and the like), who were exiled from the planet entirely. (Perceived sexism attributable to Douglas Adams and/or the fact this was a radio broadcast, so everyone has an assigned gender)

[1]: http://www.clivebanks.co.uk/THHGTTG/THHGTTGradio6.htm