One of my favorite episodes of Star Trek (original series) is The Trouble with Tribbles. The absurdity of those furry balls taking over the ship cracks me up every time. The best part is when the tribbles rain down on Captain Kirk from a ship vent. Shatner’s expressions are priceless in that scene!
I figured since tribbles are super-fertile, it would be a good thematic match for a maternity shoot.