Danish Humor
I heard this one from a friend which is a Captain for a Danish airline.........
This cargo plane came in every night and had been the only plane comming into Billund airport at that exact time for years, I guess it was the same pilot flying the plane because he started saying his callsign as " Billund Approach, Guess Who"
The controller surely thought it was funny the first couple of days when he started it, but after a few weeks the controller had enough so one night that same cargo plane came at the same time as always and the pilot called " Billund tower, Good evening guess who" The controller then turned the Runway lights off and calmy replied " Funny mann in the sky, Guess where"