Marshall: Okay, Robin, what would you do, and remember, "President of the World called parents away for a super-secret space mission" has already been taken.
Robin: Well, my dad was always upfront and honest with me, so that's how I would be.
[fantasy scene with a casually-dressed Robin talking to six-year-old Marvin:]
Robin: All right, kid, here's the deal with the deal. Your mom and dad are done-ski. Belly-flopped off a subway platform. Mom busted open like a piñata. What was left of your dad hung around for a few days. Anyway, plug's pulled. Organs donated. Long story short: I'm your new mommy now. [chuckles] Sah-wish!
[reality:]
Lily: [sobs]
Marshall: Well, I was saving these for the showcase, but here. Hey, Lily, look, baby, his-and-her watches.
Lily: Ooh.