Warning: The clip is not for those without a sense of humour.

Canadian actor Nathan Fillion appears in a new comedic PSA about the “Swamp Ass” epidemic, a spoof on video gamers and their hygiene habits (or lack thereof).

(Click here to watch the clip)

The clip is part of a series of “Nerd PSAs” created by “Nerd Machine” (you’ll see Fillion sporting their shirt in the clip) and “Break”. The clip was directed by “Chuck” star Zachary Levi.

Fillion plays crime author Richard Castle on the hits series “Castle.” Fans of Fillion and “Castle” know that the actor’s wacky sense of humour is one of the key elements that make the prime-time series work. Past hijinks include making mention of internet memes such as “Double Rainbow” and speaking Mandarin in a shout-out to his previous cult hit, “Firefly.”

The Edmonton native introduced his fans to the “Swamp Ass” clip via his popular Twitter feed (almost 900,000 followers), saying, “It's real. People deal with it everyday.”

Fillion is no stranger to spoofing his own image either; the actor has often been game to take on cheesy, over-the-top parts that put his charisma on display, including his turn in Whedon’s “Dr. Horrible’s Sing-Along Blog” musical series.

The 40-year-old actor also has an upcoming role in Rainn Wilson’s new film, “Super.”

In other “Castle” news, Marvel Comics is set to release the graphic novel version of “Richard Castle’s Deadly Storm” in September, which will feature the fictional author’s creation, Derrick Storm, in an adventure story alluded to on the series.

This isn’t the show’s first foray into making a real version of Richard Castle’s book. The series has already produced two “Nikki Heat” books, which feature a character inspired by Stana Katic’s role on “Castle,” Detective Kate Beckett.

Fillion and Katic will both be appearing at this year’s massive “Comic-Con” convention in San Diego on a “Castle” panel.  Full episodes of “Castle” are currently available online at CTV.ca. The show returns to primetime this fall on CTV.

About Tyrone

Tyrone Warner has been with CTV.ca since 2005, covering news, entertainment and everything related to CTV. When he’s away from the computer, you can find him writing, recording and performing his own music, running his own record label and dabbling in photography, painting and creative collage. Follow him on Twitter!