A cartoon caption is a work of art. It is a sitcom in miniature — but whereas a situation comedy might take half an hour to reach its punchline, a cartoon caption has to do so in seconds. Cartoonists toil endlessly, revising and rephrasing, to perfect a caption. There are rules. The funniest word has to appear at the end. The caption has to be a balance between anticipation and delivery. The line has to be succinct and the rhythm has to be right — clumsy phrasing can ruin an otherwise strong comic idea. In 2006 a blogger called Charles Lavoie wrote that every New Yorker cartoon could be captioned ‘Christ, what an asshole!’ — a concise take on Jean-Paul Sartre’s view that ‘Hell is other people’. It was, he believed, the perfect all-purpose caption.