At the beginning of each semester, I give a little pep talk. Essentially, what do you need to do to be successful in physics. It seems no one listens to me. So, I am trying something new. Maybe students will listen to students. On the final exam, I gave a space for students to give advice to future students (completely optional and worth no points). I also gave them the option to post their advice online (here). If they wanted to be acknowledged, they simply gave me their call-sign or whatever.
Below are essentially all of the responses that wanted to be included and posted online. The name in parenthesis at the beginning is how they wanted to be credited (no one put down a twitter id). I tried to accurately reproduce what they were trying to say. I couldn't help but to correct most of the spelling mistakes. There was one response that I just had to include as a picture (at the end).
Too bad I don't have a time machine (yet) or I could go back to the beginning of the semester and show these to the students themselves.