>>149921549 (OP)
There was a comment from Hirsch somewhere along the line (probably on Twitter or something) that they originally met at a birthday party when they were kids. Robbie pulled her pigtails, and she knocked out one of his teeth. And he went to say that Wendy doesn't remember it, but Robbie does. It's a shame none of that made it into the show, because it says a LOT about Robbie.