A drunken man staggers into a catholic church and sits down in a confession box but says nothing.
The bewildered priest coughs to attract his attention, but still the man says nothing.
The priest then knocks on the wall three times in a final attempt to get the man to speak.
Finally the drunk replies - "No use knockin' mate - there's no paper in this one either".
http://koningsberg.blogspot.com/
http://sugiatno-ceritalucu.blogspot.com/
