It's the only place I get a few mins' peace and quiet .
Needs to be non-fiction as I need longer periods to concentrate on novels. Pretty easy to read but not too middlebrow! And if it's funny, so much the better.
My last two loo books were by Peter Cook and by Kurt Vonnegut, to give you some idea of what I like...
NB was going to post this in 'Adult Non-Fiction' but there are only 5 threads there so you bookworms are evidently all over here!