Man, I'm so glad and relieved that I'm done with my guest lecture. No more practice, no more worrying!
Some of students looked bored during the lecture, but who cares? In the first place, some of students come and sit in class only for credits, and they don't pay attention to lecture regardless of topics of lecture, right? Am I trying to convince myself?! But, some students gave me compliments on my lecture after class, and those students made me happy. My efforts, practices, preparation and time were paid off by their compliments. Yeah, I'm a simple person.
Anyway, it's over!