ANDREW MAMBO, BYLINE: Hey, everyone. I'm Andrew Mambo, one of the producers of the show. Before we get into today's episode, we have a favor to ask. Here on the INVISIBILIA team, we've been talking about how confusing friendships can be, how it's one of the most important types of relationships we have and yet one of the least clearly defined, so we want your stories about the spoken and unspoken norms of friendship and how you navigate them. Like, have you unlocked the mysteries of making new friends? We want to know about that. Do you have a story about when you failed at friendship? Let us know. Send us an email or voice memo to invisibiliamail@npr.org and you might be featured on the show. OK, now here's the episode. It's technically explicit, but, like, my grandma would approve.