Upcoming PS4-exclusive family-oriented action game Knack was the focus of the PS4's (and Mark Cerny's) appearance on Late Night with Jimmy Fallon earlier tonight. There was much rejoicing. A good experience, overall: Fallon and the audience had a great time, and we also got to know that Knack is actually an homage to the Stay Puft Marshmallow Man from Ghostbusters. That may or may not have been a joke. Cerny, you crafty person, you. Late Night is currently hosting the Video Games Week, featuring guest appearances from game companies and video-game oriented skits. You can take a look at some of our highlights below.