I was teaching a 3rd grade class the other day where most of the students were native Spanish-speakers but were all mostly fluent in English.  In case you were wondering, the new favorite 3rd grade song is Shakira/Wyclef's new "Hips Don't Lie", or as one of the students corrected the other students with his understanding of the song title, "Hips Don't Mind".

I gave the students an assignment to color and write their name on a cardboard building.  One student decided to call his building "chingate" and thought he was pretty sneaky and showed his building to his surrounding friends.  By third grade, you should know a) that if you're going to be sneaky, you need to use a sneakier word than chingate and b) more people speak Spanish than you think (even if they don't look like it).   When I asked him (in Spanish) "what did you write?", I've never seen a marker scribble out a word so fast.  He was so shocked that I busted him, that his fear ended up being punishment enough (although I did give him the old don't-do-that-evil-eye).  Also in case you were wondering, 3rd graders don't have a filter and will make fun of your accent in Spanish.