sigh...so, I missed two small discussion lectures (just 50 minutes @8 am in a room each Friday). I mistook this room for the room I was supposed to go to for my macroeconomics class. I asked a student there if the class was for economics (should have been more specific), and she said yes. Then, I was a bit confused for two weeks as to why we were going over certain graphs, and it was something we barely went over in class. I was even more confused with having a quiz once discussion was over, since we took quizzes online.
Then finally I stepped out of the class to re-look at the number at the top of the door and it was the wrong room...(I never took the opportunity to memorize my discussion leader's name to know he wasn't my lecture leader). I had to quickly go to the other discussion the following week (luckily barely anyone attends these discussions). So, all was well...but I was just embarrassed of the thought of some people noticing some student disappearing out of class in the 3rd week...
...So, yeah...don't be an idiot like me