The semester is ramping up quickly, and the new grad students are quickly sorting themselves out. The only first-year student we got this year worked for the lab as an undergrad, so he had an idea of what he was walking into. Hopefully. More confusing is a grad student looking to switch groups who seems to be seriously considering my group even though 1) there's no secure funding and 2) she's listened to all the stories I've told here and more beside.
On the other hand, when I was a wee little graduate student, one of our former group member told me "Run. Take your fellowship money and run." At the time, I just assumed she was bitter because the equipment never worked, etc., but I realize now that she really was trying to help me. I think stubbornness is really a trait of most graduate students, though, and there's a tendency to assume that we are right until explicitly proven wrong.
What warnings from others did you ignore?