A scene with Lars as a librarian from the movie "Max Pinlig 3: På Roskilde" (2012).
The actors in this scene are Samuel Heller-Seiffert, Mette Horn and Lars Mikkelsen.
Video source: http://www.localeyes.dk
More on Lars you can find here:
Lars Mikkelsen Fansite: www.lars-mikkelsen.de (in German, with a translation tool)
Facebook: http://www.facebook.com/LarsMikkelsenPage (main language is English)