Since when did Mario find time to go to medical school? I mean, he's so busy carpenting and plumbing and climbing tall buildings to save princesses and battling evil turtles, I find it hard to believe he's a real doctor. Hmm... WARNING: DO NOT LET DR. MARIO TOUCH YOUR GENITALS, HE IS NOT A REAL DOCTOR!

From GameQuoter, about as much of a doctor as Dr. Dre.