Lily: So, are Marshall and I ready to have a baby or not?
Ted: Lily, we can't make this decision for you. It's huge.
Robin: You know what else is huge? Marshall's head. That thing's the size of a late August watermelon. Marshall's baby coming through there? Yowza.
Ted: What does Marshall think?
Robin: Probably lot in that 1950s space helmet of a head he's walking around with.