Casual party games are a great infection vector for introducing tabletop gaming to our non-gaming friends. For experienced players, they're also fantastic palate cleansers between games of Puerto Rico and Power Grid.
If you like Say Anything, you'll probably like other casual tabletop games, like Apples to Apples, Cards Against Humanity, and the three quick casual games we've already played (Tsuro, Zombie Dice, and Get Bit!).
These games are easy to learn, play very quickly, and can be found just about anywhere, from your Friendly Local Game Shop to big chain bookstores.