With news being slow on the weekends, I started a column called PSA Sunday.  As you can probably deduce from the title, every Sunday we post a PSA featuring TV or movie characters and/or celebrities telling you not to do something.  The first few weeks focused on vintage Star Wars PSA’s (the Cantina aliens in a “Friends don’t let friends drive drunk” campaign, C3P0 and R2D2 talking about the dangers of whooping cough, C3PO and R2D2 warning you about smoking) Clint Eastwood telling you not to do crack cocaine, and the Transformers warning kids about running away from home and not to bike without reflectors.For this weekend's PSA, Nathan Fillion addresses an important issue affecting gamers worldwide: Swamp Ass.  Hit the jump to watch.And for fans of NBC's Chuck, this PSA was directed by Zachary Levi.