Warren Buffett called into CNBC to surprise 17-year-old Tre Grinner, a Hodgkin's Lymphoma patient who wants to be an investment banker.
With help from the Make-A-Wish Foundation, Grinner has been working as an intern at Goldman Sachs and he was doing a live interview about that experience.
Buffett's main piece of advice for Tre as he prepares to enroll in community college this fall: learn accounting so you can read financial statements. "Accounting is the language of business and there's nothing like getting it early and getting it into your system."
Pointing out that accounting is a "language all of its own," Buffett said, "Getting comfortable in a foreign language takes a little experience, a little study, early on but it pays off big later on."