A kinda cheesy one I've done in the past while in class was to play hangman...In college I'd get bored and want to pass the time so I came up with this:
Me: (after having a little bit of a conversation) Let's play hangman. Six letter word, take a guess. ------
At any rate, you can have a lot of fun with things like this...you can tease her in person whether she was good or bad, you can use sexual words and make her guess them, and you can give her a nickname based on whether she hung herself or not
