Things picked up just as class was ending, when she was talking about shimasu (which is apparently their way of verbing nouns)...
Izumi-sensei: "mata [time words] denwa shimasu" means "I'll call you back [time words]"... *goes on to explain and give examples*
Me: *raises hand* Could you say "mata denwa shimasen" to mean "I'm not calling back"?
Izumi-sensei: You'd want to use "moo", for "anymore"--"moo denwa shimasen". But that sounds kind of mean...
Then, a few minutes later, she's doing an exercise with the class where you're calling a restaurant to make a reservation...
Class: *silent for a few seconds*
Guy: autubaku suteekihausu desu ka? (Probably fucked up the name mangling...)
Class: *bursts out laughing*
I love this class.