Bart offers to help Lisa with defeating her pin collecting addiction and manages to get back her necklace by tricking the pin vendor with `` Fatov , '' who is a phony mascot that was `` created '' in advance for the 2014 Winter Olympics but the mascot is really Homer 's mouth , clipped by Bart from his driver 's license . He manages to retrieve her necklace by tricking the pin vendor with `` Fatov , '' a phony mascot `` created '' in advance for the 2014 Winter Olympics in Sochi , Russia ; the mascot is really Homer 's jowls , clipped by Bart from his driver 's license .