Durham Caldwell found out early that he liked to make people laugh - and that he was pretty good at it. Growing up in the Cape Cod town of Falmouth, Mass., he wrote for the humor pages of his junior high school magazine. After he'd broken up his science class with one too many wisecracks, the teacher told him he was the rudest young man he'd ever seen. At Columbia University, he produced a comedy-variety show for the campus radio station. In his first radio job - in Gardner, Mass., "chair city of the world" - he produced a show called "Chair City Varieties." Then he got sidetracked. Leaving co...