Ted finds this confusing. "So what's the point, then?"
Barney, as if speaking to a slow child, says, "The point is... to get five in a row."
"And what do you get when you get five in a row?"
"I get... Bingo?" Imagine Barney saying all his lines in a "Duh," tone of voice, because it was a funny scene, but the humor was all in the delivery. Now, moving right along...
At Ted's apartment, Marshall helps Robin fix the radiator. She can't believe he's not going to pick up Lily at the airport tonight, but he regurgitates his "As we mature, our relationship matures with us" spiel -- right down to the same fey hand gestures. Oh Marshall, never change. Robin points out that Lily is likely to show up with beer for him, anyhow. Flash to Marshall's imagination. Lily and her six pack wandering the airport, calling out for him, but he's not there. A French man approaches her. "Puget Stout. A most exquisite Seattle microbrew. And speaking of six-packs..." The camera pans to Frenchy's mid-section, and he whips up his shirt to reveal one of his own. Lily moans in delight, removes her wedding ring, tosses it over her left shoulder as though it were salt and steals away with Frenchy into the dark recesses of Marshall's imagination. Back in the real world, Marshall hurries into his coat and announces to Robin that he's going to the airport. He can't believe he was so stupid. I can't believe you let Lily talk you into something so heartless, Marshall. Go to the airport. Get your girl. Don't forget to make a cardboard sign!
Next, we see Lily on her plane, in the middle of telling her seatmate all about the end of the airport tradition. "But this time, I didn't bring him a six-pack, because as we mature, the relationship matures with us." Heh, I can see Lily and Marshall coming to their decision and then practicing their rationalization speech aloud, until they have it down pat. Lily's seatmate is a cute, elderly... OH SHUT YOUR HELLMOUTH! Lily's seatmate is the wig lady, a.k.a. dickhead monster from Doublemeat Phallus! Man, I was hoping after 12 o'clock noon today, I wouldn't have to look at another dic... er... I mean, man, I hope some of you reading at home watched Buffy and know what I'm talking about, because I know I'd never click that link. Anyhow... The dickhead monster is neither dickish nor monstrous in How I Met Your Mother. We leave that to Barney. Here, she's the lovely and talented Pat Crawford Brown, who is playing a cute little old lady who thinks Marshall's so sweet he's just bound to pick Lily up at the airport despite their tradition-ending deal. Lily imagines wandering through the airport to find Marshall wearing his hat and carrying his "Lilypad" sign. She runs to embrace him. Marshall stops her. "Whoa. Whoa. Whoa. Where's my beer?" When Lily reminds him they weren't going to do that any more, Marshall turns the "Lilypad" sign around, so it reads, "SOMEONE WITH BEER." And I know Alyson Hannigan's pregnant and all, but I still wish the sign read, "Look into pants," because what the Hell is she wearing? Ignoring my cruelty to the gestating, a tall, willowy (not Willow-y) blonde walks over carrying the goods, and also beer. In a German accent, she says, "I have beer." Marshall says, "A six-pack and you're an appropriate height for me. Let's go, New Lily." He tosses the sign, puts his arm around the blonde and they stroll off together into the dark recesses of Lily's imagination. Back in the real world, Lily says, "Doublemeat is people! It's people! Or vegetables," or possibly that she's going to have to pick up some beer when they land. Just then, the captain announces that they're going to be landing an hour early. Lily lets out a "Yes, woo hoo!" and startles her seatmate. Lily, do not taunt happy fun dickhead monster.