Joe Biden and his loose lips were at it again -- this time inside a Wisconsin frozen custard shop over the weekend. It all started when the shop's owner corrected Biden about being in a "custard" shop, not an "ice cream" store. Then when the owner said he didn't have to pay for the food, but Biden could lower his taxes, the vice president joked with him about being a "smartass." The owner says he enjoyed his banter with Biden but admitted the vice president didn't like the "taxes" remark. So was it a harmless remark or should the vice president be hammered -- again -- for his potty mouth?