These amusing signs are part of a collection by Doug Lansky (previously on Neatorama), whose new book is called Ultimate Signspotting: Absurd & Amusing Signs from Around the World. Amazon lists the book as becoming available in paperback on October 15.
Lansky has a website called Signspotting, a collection of signs in the same vein as those seen here. Aside from the signs that are obviously the result of bad translations from people for whom English isn't their first language, these beg the question as to whether the responsible parties were in on the joke or not.
See all 29 signs at 22 Words.