• One nonabsolute number is the given time of arrival, which is now known to be one of the most bizarre of mathematical concepts, a number whose existence can only be defined as being anything other than itself. In other words, the given time of arrival is the one moment of time at which it is impossible that any member of the party will arrive.

    Douglas Adams (2010). “The Ultimate Hitchhiker's Guide to the Galaxy”, p.427, Del Rey