Woz read a book about a ham radio operator and was so inspired he built his own radio and took the ham operator test. It seemed that he got a lot out of it.

My cofounder and his wife once took the Diplomatic Service Exam. She had wanted to be a diplomat, he joined for support. They got through the final rounds, and it was far from boring! During their time there, they witnessed some incredible undiplomatic behavior from an actual diplomat in the foreign service, freaking out in the cafeteria line. They were quizzed ineptly on the 'canon' of American literature. Finally, (if I recall correctly) they passed the test. It was, however, useless, because all of the jobs went to Reagan's cronies, instead.