The native speaker has long been a construct to which students have been held in the language classroom (and to which we non-native-speaking teachers hold our own performance). I noticed this very starkly in my beginning German class last year and put together this short presentation/discussion to talk about the native speaker construct with students.
The presentation does the following:
(1) asks students to try defining the (ill-defined) native-speaker construct, and also to define a non-native speaker
(2) question their assumptions about whether the language usage in both of these groups is homogeneous
(3) think about what the advantages of being a non-native speaker might be. What insights could they have as people who don't take the new language/culture(s) for granted?
This activity took our class about 20 minutes, but the discussion could have continued for much longer. This PPT is in English and could be used in any language course, English or otherwise.