How You Doin?! An Etsy user created Friends-themed Cards Against Humanity. The fan-made fill-in-the-blank game is being sold on Etsy by Daisy Store Gifts and includes 99 grey cards and 180 white cards. While not affiliated with the official Cards Against Humanity product (or the show, for that matter). To make it even easier and cheaper to get this pack, there's a printable version of the cards, where you buy a PDF digital download of the cards, which you then print at home.
Know someone that's a big Harry Potter fan? There's also a Cards Against Potter pack!