Legend has it that Casual Friday in that golden age of IBM meant that you could work that day with your suit jacket unbuttoned. Since we're all tossing out our

Legend has it that Casual Friday in that golden age of IBM meant that you could work that day with your suit jacket unbuttoned. Since we're all tossing out our favorite lines, I'll nominate the Prolog entry. I know nothing about Prolog but it still gives me a laugh on every read. His goal is to create a language with the intelligence of a two year old. He proves he has reached his goal by showing a Prolog session that says "No." to every query.