Yeah ATC do loose a sense of humour at times, bless 'em. My best was when a newbie controller at a local field lost the plot with 11 planes in the circuit 5 of which were on final, hi pipes on the airwaves and says...
"All aircraft on final....SCATTER!"
Everyone assumed an uncontrolled airfield for the next 30 mins, it was so funny! Everyone was giggling on air!