A chicken walks into a library, walks up to the counter and says to the librarian "Book, book".
The librarian gives the chicken two books - she puts the books on the chicken's head - and the chicken walks out of the library.

One hour later, the chicken walks back into the library. It walks up to the counter and says to the librarian "Book, book".
The librarian gives the chicken two books and the chicken walks out of the library.

An hour later, this happens again. "Book, book", and the chicken walks out of the library with two books on its head.

But this time the librarian thinks, "Hmm, this is strange" so she decides to follow the chicken.
She goes out of the library and follows the chicken.

The chicken crosses the road, walks along the street, turns the corner, until it comes to the lake.

Sitting by the lake is a big, fat frog.

The chicken gives the books to the frog and the frog looks at them and says "Read it, Read it".

doh:

Crap joke! But somehow makes me chuckle