I don't know what's in their cups, but they look pretty young so I want to say it's juice. That's all. I'm not encouraging you to go and play this game of revelry (and rivalry). But I am suggesting at the end that you will fall down. On that note, and on the reverse side of the flipbook, you will find instructions on how to draw your own, using the math and art techniques that were employed to compose the one that i haven't uploaded yet.