Not too long ago I was doing Luton Radar and was free-called by a callsign requesting zone transit. Unfortunately, because of the noise of the children screaming in the back of the aeroplane I couldn't make out many of the details or even be sure of the complete callsign. After several attempts I explained politely that unless the pilot could shut the kids up I would not be able to offer a service. He acknowledged this and still with his finger clasped to the PTT switch, turned around and told the kids to "shut the f##k up"! This seemed to do the trick and he continued to transmit, for the forth time, his flight details. Unfortunately, I was laughing so much that I had to ask him to repeat them two more times before I could offer him the transit clearance he was requesting!