TVLine Items: HIMYM Plans Super-Sized Holiday Ep, Dirty Jobs Goes Out of Business and More!

How I Met Your Mother has a super-sized Christmas gift for fans.

Co-creator Craig Thomas has announced via Twitter that CBS will air an hour-long holiday installment on Dec. 17 — the series’ first ever XL ep.

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“Some really big crap happens!” he teased. Like mayhaps a Barney and Robin surprise engagement? One can dream!

Ready for more of today’s TV dish? Well…

• Discovery has scrapped two of its long-running series, Dirty Jobs and American Chopper. The latter will air its final installment Dec. 11. (Mike Rowe first announced the Dirty cancellation in a HuffPo blog post on Wednesday.)

• Mia Kirshner (The Vampire Diaries) will guest-star in an episode of USA Network’s upcoming series Graceland, reports. From White Collar creator Jeff Eastin, the series centers on various undercover law enforcement agents living together in Southern California. She’ll play a medical marijuana farmer.

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• Camille Guaty (Las Vegas) and Charlie Bewley (Twilight) have booked multi-ep arcs on The Vampire Diaries. Per, Guaty will play a woman from Professor Shane’s past, while Bewley joins as a mystery man named Vaughn.

• Judd Apatow (Girls) revealed via Conan O’Brien’s web series Serious Jibber-Jabber that The Simpsons is putting into production a spec script he wrote some 22 years ago. The installment involves Homer being hypnotized into thinking he’s a 10-year-old.

Which TVLine Items have you talking today?