Filming is underway for Supernatural's 200th episode, and the upcoming project is producing enough laughs amongst the cast and crew to ensure viewers that it will indeed be something special.

Titled "Fan Fiction," the milestone episode started filming last Friday. By Wednesday, writer Robbie Thompson was enjoying watching his words come to life.

"Watching dailies for 200. Y'all are killing it!" Thompson tweeted, later telling Ackles and Padalecki that they were the "Best. Dailies. Ever.

Described as a meta episode, "Fan Fiction" will be comparable to season 5's "The Real Ghostbusters."

"We're not at a convention but we're at a place where they're doing a play based on the Chuck Shurley books," Padalecki explained, according to Zap2It. "So not only are these books based on our lives, now people are doing a play based on these books, and someone is haunting it, so we go and try to investigate what's going on at this play, based on the books about our lives."

Check out the photos above to see what the Winchesters are up to, and find out more when Supernatural returns to The CW on Oct. 7 at 9 p.m. ET. Click the video below to see the final moments of the season 9 finale, "Do You Believe In Miracles."

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