Terry Pratchett's Discworld 2016 Diary

One part diary, one part guide to the arcane practices of the funniest creation in modern fantasy, 100% Discworld goodness. With their trademark mix of cultural ephemera, background detail and hilarious one-liners, the Discworld diaries are back. And 2016's diary gives a long-awaited insight into the wit and wisdom of some of the Discworld's most-loved characters, the Witches.

Or, as Granny Weatherwax puts it:

"I don't hold with diaries. If a witch don't know where she's been or where she should be, no amount of writing it down in long and diverse letters will make any difference.

There are some who say that making a note of birthdays and the like will mean you get a lot of presents but I think Gytha is wrong.

But suit yourself.

Personally I can't be doing with it."