Everyone sort of cringes at Barney, so he changes the subject. "Intervention banner, what was that for?" Ted says, "Stella," and Barney rips his envelope out of his suit coat pocket and starts to read the letter inside. "Ted, I cannot stand idly by..." Ted interrupts to ask Barney if he's just been carrying that around. Barney gives him a look like you give a child who needs to mind his manners and says, "Please, Ted." He resumes reading his letter. "I cannot stand idly by while you make the biggest mistake any man can make -- getting married. Mark my words. This whole thing is gonna go... up... in... flames!" And we see Barney's intervention didn't take, as a huge fireball flashes between him and the others, devouring the letter. Barney realizes he put the "flame cue" in the letter too early, which is too bad, because he had so much more to say. "The point is, Ted, marriage is stupid." Neil Patrick Harris's delivery is flawless as usual. "Every year, there are a million new, hot 22-year-olds walking into bars." I'd be willing to believe Barney's done the math on that. "And call me glass half-full, but I think they're getting dumber." Marshall tries to stop him, saying even Barney won't still be hitting on 22-year-olds when he's 80. Haaaaave you met Barney? Barney accepts that challenge. He will prove that he'll be exactly as awesome as he is now when he's 80, and he'll do this by picking up a 22-year-old while in his old man make-up. Marshall says, "I didn't remotely challenge you to that. I -- I mean, I definitely want to see it, but I didn't remotely challenge you to that." Barney leaves, with what I'm sure is missionary zeal.

Ted wants to hear the other letters. Lily objects, saying they've all changed their minds. Ted says, "Supposing you change them back! Lily, come on, let's hear yours." He hands it to her, and she reads. "Gilbert's reading skills have improved drastically since... wait... this is a letter I meant to send home with one of my kindergarteners." Her eyes go wide. "Uh-oh." Cut to a little boy's bedroom. He sits on the bed as his mother holds a letter. "Gilbert, are things moving too fast between you and a girl named Stella?" Gilbert says, "I wish." He's in kindergarten? Barney needs to take this kid suit shopping, pronto. Cut back to the apartment, Lily looks horrified as she takes a seat on the couch. Ted asks to hear Robin's letter. "Dear Ted, it's en-cyclo-PEE-dee-ah, not en-cyclo-PAY-dee-ah. Why do you always say things in the most pretentious way possible? It makes you sound douche-y, and that's DOO-shee, not doo-SHAY." Ted says she already read that one at his pronunciation intervention and wants to hear the letter about Stella. Robin didn't write one. "I'm your ex-girlfriend. I figured anything I said on the subject would sound catty. Plus? I'm hotter than her, so who cares?" Who's a pretty kitty?