There are six glasses, featuring many of the characters from the original Pac-Man. They are Pac-Man (duh), Inky, Blinky, Winky, and Clyde, there is also the Cherries.
They are 1.5 fluid ounces each and look cool as hell, even in their 8-bit glory. What would you do while drinking from these glasses? Play Pong. No, I would recommend you start with Pac-Man, and then maybe, as your faculties leave you, you could downgrade to Pong.