Enjoy a cup of coffee and make everyone smile with Joey ' s popular pick up line! This standard sized heat change mug features the everyone ' s favourite line ' How you doing? ' emblazoned on its side when hot. When cold the mug is black featuring only the Friends logo. Once you've poured in your favourite hot beverage the mug turns green and Joey's pick up line appears with the instantly recognisable New York skyline in the background. A great gift for Joey fans, and lovers of the show in general, this heat change mug is a perfect gift for Christmas and birthdays.