[This post was originally published over 6 years ago. It is still extremely relevant!]
Recently saw a comment by a student about not being advised before hand that doing a PhD had many difficulties and challenges. However, my first reaction reading that text was to start laughing. Of course, all that was said was true. But the first thing that came to my mind was the famous warning when you ask for a sundae with nuts at a McDonald : you received (at least in North America) the nuts in a small, sealed separate bag (think allergies); this bag has a warning that reads (seriously): may contain nuts!
Doh!