Costumed trick-or-treating takes its inspiration from the Celtic holiday Samhain—“summer’s end” in Irish—more than 2,000 years ago. Samhain marked New Year’s Day and fell around ...

(One of Halloween's hallmarks includes the "trick" in "trick and treat," after all.) Today, April 1 brings out tricksters in Europe, the Americas, the Middle East, and beyond, with their ...