Mathematical trivia (i.e. collections of anecdotes and miscellaneous (recreational) mathematics) Can you suggest some books on mathematical trivia? 
I use the word "trivia" with a double meaning in this case:


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*curious anecdotes that enlighten what the real life of mathematicians is like (like the ones in Mathematical Apocrypha Redux);

*curious miscellaneous (also mainly recreational) mathematical ideas and topics with only occasional anecdotes and jokes (like the ones in Professor Stewart's Cabinet of Mathematical Curiosities and Professor Stewart's Hoard of Mathematical Tresures).

The book Mathematical People: Profiles and Interviews has some nice anecdotes.
