I am all for free speech. But pretending to be someone you are not to get them to reveal something can be fraud. Revealing confidential medical information is a crime in most countries. These pranks sound funny until someone gets hurt: Nurse who was duped by radio hosts (pretending to be the Queen and Prince Charles) in revealing medical information about Kate Middleton committed suicide. She was obviously crushed she was tricked into doing something she would never do intentionally.