Harry Potter Charades
It turns out they were playing 'What Harry Potter Character Am I?' (catchy name, I know). They'd found a list of every character in the Harry Potter universe, printed it out (see above), and numbered each sheet and character. Then they'd choose, unseen, a number combination (say, 5-18), look it up, and then perform it for the others to guess.
For example, if I had chosen 5-18, I'd be a Gryffindor Quidditch player... a Chaser... future wife of George Weasley...
Can you guess who I am?