Nathan Fillion has a message for all you summertime gamers out there: Swamp Ass is real. It is a devastating condition, and while nobody knows just how many are afflicted with this malady, there's a good chance you're affected.

You may have Swamp Ass and not even know it!

And so he's recorded this PSA, because the more you know, the - uh - look, just do something about your ass, already!