At just £2.99 from Boxtree Books A Little Book of Dumb Questions, compiled in 2001 by the ubiquitous Michael Powell (author of 101 Illnesses You Don't Want to Get, A Little Book of Crap Advice and Dung) is the perfect addition to your loo-side library.
Almost all are worth revisiting and there are too many favourites to actually call any of them 'favourite'. Ones I'm particularly keen on include:
Doesn't 'expecting the unexpected' make the unexpected expected?
Why isn't 'phonetic' spelled the way it sounds?
Is there something you can take for kleptomania?
Can you imagine a world with no hypothetical situations?
If gifts are free, what is a 'free gift'?
Is it possible to be totally partial?
Why isn't there more than one in every crowd?
Can you be a closet claustrophobic?
If all the world's a stage, where is the audience sitting?
What's the word for when you can't remember the word?