How I Met Your Mother
Episode Stills

We know on Monday's episode, "Slapsgiving 2: Revenge of the Slap," two things are for sure:

1. Chris Elliot will be guest starring as Lily's estranged father, Mickey.
2. There will be at least one slap of Marshall's remaining slaps against Barney.

However, executive producer Carter Bays is still keeping his mouth mum about the exact details of the slap.  He says, "There’s a little bit of a twist on the slap this year.  The Slap Bet commissioner makes an interesting ruling that I can’t reveal."

We will give you a hint.  Marshall gives away his slap and it will be used by one of the other How I Met Your Mother cast members... or Lily's father.  Watch their potential slaps in action:

Back in season two of How I Met Your Mother, Marshall was awarded five slaps against Barney, courtesy the official Slap Bet Commissioner, Lily.

Now, in season five of the sitcom, Marshall still has two slaps remaining. How will he dole them out?

In HIMYM tradition, these will occur in the upcoming Thanksgiving - err, Slapsgiving - episode that airs in just two weeks. The episode will be cleverly titled "Slapsgiving 2: Revenge of the Slap."

The fun twist on the remaining slaps? Marshall will actually be handing the rights to slap Barney over to Ted and Robin. We wan't wait to see how they use them!

Slapsgiving 2 will also mark the episode where Chris Elliot guest stars as Lily's estranged father. Check out the following episode stills that feature Elliott and the rest of the cast:

How I Met Your Mother is one of the funniest shows on TV. But this isn't a joking matter:

On the sitcom's November 9 installment, Barney Stinson gives in to what producer Carter Bays refers to as a "relationship gut." Having already gotten the girl (Robin), the character really lets himself go, risking diabetes and heart disease.

"It’s a phenomenon that a lot of people can relate to, certainly more than a few people on our writing staff. It’s relationship gut,” Bays told People magazine.

The show's co-creator added that Neal Patrick Harris was more than game to don a fat suit:

“He was loving it. He was like, ‘Give me the biggest fat suit you’ve got.’”

In probably the scariest set of upcoming photos we've ever received for How I Met Your Mother, Barney will be kissing Lily in an upcoming episode.  Just look at the following picture.

Okay, now that we scared you with that we can tell you the premise!  In the upcoming episode, "Bagpipes," Robin and Barney have a fight and Lily and Marshall help mediate things.

Meanwhile, this leads to Barney trying to picture what his life would be like married to Lily.  So don't worry folks, your favorite couple is safe.

Here's some more pictures from the upcoming episode:

On Monday's episode of How I Met Your Mother, "Duel Citizenship," Barney attempts to make Robin more American in order to help her become a US citizen.

Meanwhile, Ted and Marshall plan a road trip to Chicago to go to their favorite pizza restaurant, while Lily decides to tag along.

Watch the following promo clip for the upcoming hilarious-looking episode:

We also go our hands on the following episode stills: