Loretta: Robin can't have kids? But you always wanted children.
Barney: No, I always liked children. I've always wanted a Lamborghini where there's a hot tub inside. God, I wish that existed.
Loretta: So no grandkids. How long have you known about this?
Barney: I found out last fall.
[flashback:]
Barney: [v.o.] Robin and I had been hanging out downtown at this very cool secret bar.
[Barney and Robin emerge from a covering in the sidewalk]
Barney: What a lovely place! Have you ever had sushi that fresh?
Robin: Okay, I am never getting on a mechanical bull again.
Barney: I can't believe Marshall and Lily missed out. Promise me, if you ever have kids, you'll sometimes get a babysitter and come have an epic night. Oh, and, P.S., bring the babysitter, she sounds dirty.
Robin: Actually, I, uh, I can't have kids, so that's not an issue.
Barney: Really?
Robin: Yeah.
[Barney hugs Robin]
Barney: Is it weird that I'm hugging you like this?
Robin: No, it's not weird. [rain pours] Now it's weird.
Barney: Yep, the rain makes it weird.
[present:]
Barney: Mom, I'm not marrying some future possibility of starting a family. I'm marrying a girl... who means more to me than kids. Or my career. Or even the Lambor-cuzzi, patent pending. So please, be nice to her?