Best one I have heard so far was about 4 weeks ago in the morning. Adelaide approach has an American working for them that always seems to be quite funny. He has to be the most casual and relaxed ATC'r that I have ever heard.
ADLAPP: "Singapore XXX, cleared ILS 23 approach, contact tower at 5 miles"
Two seconds pass with him still transmitting (can hear him moving around)
ADLAPP: "Virgin XXX, decend to 3000, track direct to Modbury"
Another 5 seconds pass, he hasnt realised that he's still transmitting
ADLAPP: "Singapore XXX, did you recieve my last transmission?"
Then you hear him go "hang on" and some russling around before a panic'd "oh shi*" and finally the transmission cuts.
SING: "Cleared ILS approach, tower at 5 miles, Singapore XXX"
VIRGIN: "Decent to 3000, track to Modbury and thanks for the entertainment, Virgin XXX".