Have you ever been in a meeting with your supervisor making obvious that you are completely unprepared? Today I felt horrible as I met with my supervisor and could not answer most of his questions, hadn't read my stuff, hadn't got good reasons for why I used one methodology and not another etc... it was so embarassing! I left his office so disappointed with myself... Is that what is considered to be "a low point" during a PhD? Or should I expect worse? :-)