Japanese with Mexican
I just did something quite nerdy: after my Japanese class, I went to a Mexican restaurant with a couple of very smart fellow students, and one of them said we should speak Japanese. So for most of our time there, we did that, until I realized that one of them wasn't paying attention to my badly spoken reflections. So we switched to English towards the end. But it was really nifty to be Japanese-speaking Americans in a Mexican restaurant. At least we got some practice, since I don't get many chances to speak.