I know this thread is past it's due date but I just felt I had to express my annoyance at this phrase. Now in 2013 I hear "You are joking me" used on TV, radio and even by my own family members (though I think they just say it to wind me up). For me this is not correct English but I'm sure as time moves on it will gradually become the norm. As for me I am thinking of starting a campaign solely for the purpose of ridding us of this annoyingly incorrect use of the English language.