Conan the Librarian: A force against the meek and mild librarian stereotype everyone has come to love and adore. In addition to being a Dewey Decimal badass, he also is a great punisher of overdue books.
You'll never return your books late again. :) Enjoy!
This clip is from the movie UHF (1989) with Weird Al Yankovic and directed by Jay Levey. You can find full information from it at IMDB: http://www.imdb.com/title/tt0098546/