My Senior Project (for English) consisted of me bringing in all the Nintendo consoles/handhelds and I brought SSB:M for a tournament thing. Thats about the most I've seen as consoles being played in HS. Then 2 years before, I brought in Perfect Dark (English again, heh) as a demo for "future weapons" since me and a few friends were doing a presentation on weapons and I got the topic of futuristic weapons. So it worked out good. I haven't really walked into a classroom in which other people are playing something, but eh, I won't be anymore.
