I remember having read, about 15 years ago, a transcript of a lecture given by Richard K. Guy, titled "How not to be a graduate student". He gave lots of advice, mostly humorous, concealing sharp and deep observations.
Unfortunately, I haven't been able to locate this text on the Internet; I have the feeling I had read it in a newsgroup list, and these things don't seem to exist anymore.
Does anyone perchance have a copy of this?