The Justice and Peace class text starts the chapter on diversity and community with a story about a school having a Mix It Up Day. We used to do that at our school, but the committee that planned it became discouraged when students didn't really participate. That led to a good discussion and a "map" on my board showing which group sits where in the cafeteria.
So I came up with an idea for extra credit, and some students seemed interested, though I don't know if they'll follow through. All they have to do is introduce themselves to some freshmen and find out about them. Then they need proof to show me. Here's the cool thing: the frosh, unlike the rest of the students, have webcams. They can shoot a little video or a still shot to hand in with some text. Someone wanted to know if they could Skype! Sure, if I'm free. I'll see them, but they won't see me. Because I have a "sophomore" laptop.