Ha ha

A duck goes into a library and waddles up to the counter.  "Buk" he quacks.  The librarian looks at him quizzically.  "Buk" repeats the duck.  Well, thinks the librarian, in these PC days you have to be careful not to be judgmental or discriminatory, so she hands the duck a book, which it tucks under its wing and waddles out.  Half an hour later it's back, plonks the book on the counter and quacks "Buk" again.  Fast reader, thinks the librarian and gives the duck another book and off it goes.  Half an hour later it's back again - "Buk".  So the librarian gives it another book, but this time decides to follow it and see where it goes.  So she follows the duck through the town centre and into the park and through the park to the lake, and there on a big waterlily leaf in the middle of the lake is a frog.  The duck swims over to the frog and puts the book down on the leaf.  The frog looks at it and says "Reddit".