A followup to E Wesp's post on trading classrooms: a month ago I had an idea for a new television show called, you guessed it, "Extreme Teaching." Possible challenges: the competitors get handed a novel they've never read five minutes before class begins and have to lecture; competitors have to teach an entire semester of a language they've never studied (this is my personal dream, though no one will--rightly--ever let me do it); competitors have to prepare students for a test in a subject they haven't studied... and so on. As you can see I'm kind of stuck: most of the ideas I have involve either cutting down on preparation time or teaching unfamiliar material (I've left out Survivor-style ideas like teaching while eating bugs or bungee-jumping, etc.). But I'd watch that show a few times.