Ouch... I apparently love physics, but I'd flee a class if it had such a terrible teacher. Ok, to be honest I fled a lot of classes because of the profs - I quite often ended up attending a lecture exactly twice, for the very first one and the exam, while learning everything myself from books, because the lectures themselves just did not bring it due to the profs. So yeah...

And hey, as long as we have one language we both understand, everything is fine :D Japanese is cooler than German anyway. So don't you dare to feel obliged!