Details; or, Me Chinese, Me Play Joke

My sophomore year of college I took a semester of Mandarin. It was a five-day-a-week class, but I thought we only met on Tuesdays and Thursdays, so I missed the first Monday of class. I showed up the next day, thinking it was the first day. When the professor walked in, she was greeted with a chorus of "Ni hao!" and other Chinese pleasantries. I was flummoxed. I seemed to be the only one in class who knew no Chinese. I still didn't realize the mistake I had made regarding the schedule, so I didn't go to the class the following day, either. Naturally, on Thursday I was even further behind. After class my professor asked why I had missed two days, and suddenly I felt like an even bigger idiot than I had when I felt I was the only one in class who couldn't speak Chinese. Everything turned out okay in the end (except that I only got a B in the class and I don't remember any Chinese).