New Brewers outfielder Christian Yelich naturally ran into Clay Matthews at the gym

When in Wisconsin, do as the Wisconsinites do. Now that he's in the great sausage capital of America, recent Brewers acquisition Christian Yelich made sure to snag a photo with another Wisconsin sporting (and advertising) legend: Clay Matthews, the Green Bay Packers linebacker. 

While the photo is nice, it does leave one to wonder: When did Yelich pick up a "Party at Napoli's" T-shirt? And is his wardrobe just filled with the inside joke tees from every other team in the league?