people who know the difference between/among:
-there/they're/their
-two/to/too
-its/it's
-your/you're
AND. people who don't ask me what language i study when i say my major is linguistics.
AND. people who don't ask me what anime i watch or what J-pop i listen to when i say i study japanese. (and the japanese and linguistics thing is just a correlation thing, not a causation thing.)
:P