It is only 41 pages, a quick read. There is not much more to say, without just quoting. Suffice it to say it is funny, and makes you realise not all heads have the same things going on inside, and some heads have no idea what is going on outside.
A short quote: -
Customer: (holds up a biography): Do you have this book but without the photographs?
Bookseller: I think the photographs are published alongside the text in every edition.
Bookseller: I suppose so you can see what everyone looked like.
Customer: I don't like photographs.
Customer: Could you cut them out for me?