I was studying a letter, and she walked by...
Her: What are you up to?
Me: Seeing if this is a recommendation letter. Do you know German?
Her: No! Um - do you?
Me: Just enough to confuse myself further. (reading & paraphrasing) He went to a meeting at Universitat Zurich, gave a speech, looks like.
Her: How do you know German?
Me: I pick stuff up.
I ended up walking around the mostly-empty department and poking my head into the few empty offices: "Do you speak German?" I finally found a professor who speaks a tiny bit of German and is in possession of a Czech-to-German dictionary; we established that the letter was a teaching evaluation.
I just love making my boss's head spin, though. That was funny.
EDIT: Don't start talking to me in German, though! I really seriously only know the tiniest bit.