So you can imagine The Black Swan author's surprise to find out his b-school chum is an alleged insider trading specialist.
Nassim Nicholas Taleb, author of The Black Swan, got a shock when he opened the newspaper last weekend and saw a picture of an old classmate from Wharton business school at the University of Pennsylvania.
"He was an extremely likeable fellow, chubby, a warm personality. If I had to give my keys to someone in case of getting locked out of the house, he'd be the kind of guy I'd go to."
"I thought: What is this guy doing with the FBI?" Mr Taleb said of Raj Rajaratnam, the Galleon Group hedge fund manager charged last week with alleged insider trading.