I realize it’s not very PC, so I’ll explain that I really don’t mean “No Girls Allowed” in a malicious way. It comes from a favorite book from my childhood. I used to burn through Berenstain Bears books like there was no tomorrow. Around the time that my mother was pregnant with my younger sister, I came across the following:

Inspired by the children’s story (which I’m sure had a more accepting ending than beginning), by brother and I formed a sort of union and disseminated literature making it clear we were not interested in getting a new sister, as seen here:

I saw the picture over Christmas break, and just sort of had the phrase stuck in my head. We did end up getting a sister, and she hasn’t even been that bad.