P'unk Burger, at 1823 East Passyunk in Philadelphia, will celebrate their first birthday by giving away FREE cake milkshakes on Friday, February 12, 2016, from 5:00pm to 7:00pm. Customers will enjoy a free limited edition P'unk and Sweet Box collaboration - a Raspberry Red Velvet Spodee shake made with Sweet Box's signature cupcakes.  The shake will be free Friday, but you can also purchase this decadent option during the rest of Valentine's Weekend.