Considering how many TV series, for whatever reason, fail to take off, when you reach your 100th episode, it’s definitely worth noting. When I visited the set of How I Met Your Mother‘s 100th episode, co-creator Carter Bays told me he definitely felt proud of their accomplishment, saying, “The 100th episode is the reason you start writing a sitcom. There’s something about three digits… What we set out to do at the beginning of this show was tell a long, winding saga and it’s kind of exciting feeling like we’re really deep into that saga now.”

Co-creator Craig Thomas added that the 100th episode, “Girls vs. Suits,” “feels like a very celebratory episode. It ends with a big musical number. We viewed it as this on-camera celebration. Like a party we’re sort of throwing for the fans at the end of the 100th episode, just to sort of say thanks. Thanks for being part of this party and let’s just go out of episode 100 with a bang and start the next 100 episodes with some good energy.”

That aforementioned musical number is performed by none other than Neil Patrick Harris, whose character, Barney Stinson, has a new goal. As Harris explained to me, “Barney needs to nail the hot bartender [played by former WWE diva Stacy Keibler] that works at MacLaren’s. Oddly, he’s never banged a hot bartender before. He has a lot of conquests, but never a hot bartender.”

However, Harris noted that a big dilemma occurs for Barney when he learns that Keibler’s character, “doesn’t like guys in suits. Her past three exes were suit wearers and she despises them.” Hence, Harris remarked, “Barney has to choose between giving up suits to bang her or leaving her and keeping his suits – and he sings about it! The next logical step is he sings about it!”

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