Topics for the third-season premiere include Karl's theory on museum collections; an invention for a mug coaster; and a fashion-trend disappointment. Also: Karl's movie idea about a man whose brain is transplanted into Tom Cruise's body.

Topics include Karl's thoughts on wills and suggestion of marriage as a tax shelter. Also: Stephen recalls a costume from his childhood; Karl pitches an idea for charitable pursuits.

Karl explains why he'd like to join the Army and recounts his most harrowing acts of bravery.

Topics include Room 102, based on George Orwell's Room 101 from "1984"; an idea for stopping overweight people from eating late-night snacks; and what Karl would take to a desert island.

Karl describes a typical day in his life, which includes spending time alone working on do-it-yourself projects.

Ricky, Stephen and Karl share their definitions of what it means to be an Englishman. Also: Karl explains why, if he wasn't English, he'd rather be Italian.

Topics include Karl's views on capital punishment; Ricky's observance of the Ten Commandments; and how Karl would deal with a hostage situation.

Topics include Karl's thoughts on medical advancements; sickness; and an idea for a machine that would enable physicians to feel their patients' pain.

Topics include the origins of the universe and the evolution of creatures other than humans. Also: Karl discusses the downside of recycling; world travel; and restroom encounters.

Topics include the laws of society and what Karl would do if he were in a position of authority. Also: Stephen asks Karl how he would have reacted had he been on the bus with Rosa Parks in Alabama in 1955.

Topics include Karl's thoughts on the importance of historic artifacts and how his book will be viewed in the future. Also: Karl ponders the meaning of popular wartime expressions and what life is like for a soldier's spouse.

Topics include Ricky and Stephen watching soccer's World Cup while sharing a hotel bed; the problems of overzealous sports fans and cheating in sports; Ricky's childhood soccer tryout; and Karl's saliva production.

Topics in the Season 3 finale include Karl's thoughts on the insect world; and Stephen's embarrassment when buying condoms. Also: entries from Karl's diary about cutting avocados, dating twins and visiting his parents.