Rob McElhenney and Kaitlin Olson, co-stars in "It's Always Sunny in Philadelphia," stopped Monday night at the Wrap Shack (120 S. 18th), where Olson bonked her knee on a table on the way out. The couple and the rest of the cast are here shooting for a week or two. Today the show is to shoot near the Italian Market, including the exterior of People Paper graphic designer Jon Snyder's house. There are a few more upcoming shoots throughout South Philly.