The NCAA Basketball Tournament is under way again, and as usual, billions of dollars will be wagered on those addictive brackets. But when one of the smartest money men on the planet puts his coin on the line, he's not betting on winning teams -- he's betting against winning gamblers.In this segment from the episode of Motley Fool Answers, Alison Southwick and Robert Brokamp talk about Buffett's generous offer for an even close to perfect March Madness bracket, as well as a pretty large charity bet he made a decade ago against those perennial big-money gamblers: hedge fund managers.